An electromagnetic wave is transporting energy in the negative y direction. At one point and one instant the magnetic field is in the positive x direction. The electric field at that point and instant is:Why is (D) the answer? I thought it's (C)A) positive y directionB) negative y directionC) positive z directionD) negative z direction

Answer:

P = 1 x 10⁸ Pa

Explanation:

given,

radius = 2.0 ×10⁻¹⁰ m

Temperature

T = 300 K

Volume of gas molecule =

[tex]V = \dfrac{4}{3}\pi r^3[/tex]

[tex]V = \dfrac{4}{3}\pi (2\times 10^{-10})^3[/tex]

 V = 33.51 x 10⁻³⁰ m³

we know,

P  V = 1 . k T

k = 1.38  x 10⁻²³ J/K

P(33.51 x 10⁻³⁰) = 1 . (1.38  x 10⁻²³) x 300

P = 1.235 x 10⁸ Pa

for 1 significant figure

P = 1 x 10⁸ Pa

Answer:

impedance Z = 416.66 ohm

voltage across inducance V = 346.99 V

power factor = 0.720

Explanation:

given data

resistor R = 300

voltage amplitude = 500 V

resistor = 216 W

to find out

impedance and amplitude of the voltage and power factor

solution

we apply here average power formula that is

average power = I²×R     ............1

I = [tex]\frac{Vrms}{Z}[/tex]

so

average power =  ([tex]\frac{Vrms}{Z}[/tex])²×R

Vrms = [tex]\frac{1}{\sqrt{2} }[/tex] × Vmax

Z = V × [tex]\sqrt{\frac{R}{2P} }[/tex]

Z = 500 × [tex]\sqrt{\frac{300}{2*216} }[/tex]

impedance Z = 416.66 ohm

and

we know voltage across inductor is here express as

V = I × X     .............2

so here X will be by inductance

Z² = R² + (X)²  

(X)²  = 416.66² - 300²  

X = 289.15 ohm

and I = [tex]\frac{V}{Z}[/tex]

I = [tex]\frac{500}{416.66}[/tex]

I = 1.20 A

so from equation 2

V = 1.20 × 289.15

voltage across inducance V = 346.99 V

and

average power = Vmax × Imax  ×  cos∅

tan∅ = [tex]\frac{289.15}{300}[/tex]

tan∅ = 43.95°

so power factor is

power factor = cos43.95°

power factor = 0.720

The problem involves the use of Ohm's law, impedance, power, and a power factor in an AC circuit. The impedance of the circuit, the voltage across the inductor, and the power factor can be calculated using given values, the principle of impedance and the relationships among AC voltage, current, resistance and power.

The question involves an AC circuit composed of a resistor and inductor in series connected to an AC voltage source. We have a resistor with a resistance (R) of 300 Ω and a dissipated power (P) of 216W. The voltage amplitude (Vo) of the AC source is 500 V. It is important to remember that in this context, impedance (Z), which has a unit of ohms, represents the total resistance in an AC circuit and can be calculated using Ohm's law for AC circuits.

(a) To find the impedance Z of the circuit, we consider that the power P is given by the relation P = Vo^2/R, substituting for P, and R, we can solve for Vo, which will be sqrt(P*R). Then, the rms voltage (V) is given by Vo/sqrt(2). Our current I would be P/V. Finally, applying Ohm's law, Z=V/I would give us the impedance.

(b) The voltage across the inductor can be found by using Pythagoras' Theorem in the context of an AC circuit, VL = sqrt(Vo^2 - VR^2), where VR is the voltage across the resistor (equal to I* R).

(c) Lastly, the power factor can be found as the cosine of the phase angle θ, which can also be defined as R/Z. We'd first calculate θ = arccos(R/Z), and then find the power factor as cos(θ).

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Answer:

Mass of water 2.9g

Explanation:

Ice

[tex]m_{ice}=100g[/tex]

[tex]c_{ice}=2J/g.K[/tex]

[tex]T_{ice,initial}=-10\°C[/tex]

[tex]T_{ice,final}=T_{equilibrium}=-5\°C[/tex]

Water

[tex]c_{water}=4J/g.K[/tex]

[tex]T_{water,initial}=10\°C[/tex]

[tex]T_{water,final}=0\°C[/tex]

[tex]T_{equilibrium}=-5\°C[/tex]

[tex]l_{water}=300J/g[/tex]

[tex]m_{water}=?g[/tex]

Step 1: Determine heat gained by ice

[tex]Q_{ice}=m_{ice}c_{ice}(T_{ice,final}-T_{ice,initial})[/tex]

[tex]Q_{ice}=100*2*(-5--10)[/tex]

[tex]Q_{ice}=1000J[/tex]

Step 2; Determine heat lost by water

[tex]Q_{water}=m_{water}c_{water}(T_{water,initial}-T_{water,final})+m_{water}l_{water}[/tex]

[tex]Q_{water}=m_{water}*4*(10-0)+m_{water}*300[/tex]

[tex]Q_{water}=40m_{water}+300m_{water}[/tex]

[tex]Q_{water}=340m_{water}[/tex]

Step 3: Heat gained by ice is equivalent to heat lost by water

[tex]Q_{ice}=Q_{water}[/tex]

[tex]1000=340m_{water}[/tex]

[tex]m_{water}=2.9g[/tex]

Answer:

Dirty bomb

Explanation:

Among the nuclear bomb One type is a "dirty bomb." It combines a conventional explosive such as the dynamite with radioactive material which can spread when the system explodes.  The explosion is releasing "dirty" bits of radioactive particles which are extremely harmful and can cause loss equivalent to a nuclear attack.

Answer:

W= 61.3 N

Explanation:

The only force acting on the satellite is the one due to the attraction from Earth, which obeys the Newton's Universal Law of Gravitation, as follows:

Fg =G*ms*me / (res)²

This force, also obeys the Newton's 2nd Law, so we can write the following equation:

G*ms*me*/ (res)² = ms* a = ms*g

We call to the product of the mass times the acceleration caused by gravity (g), the weight of this mass, so we can write as follows:

G*ms*me / (res)² = ms*g = W (1)

where G = 6.67*10⁻11 N*m²/kg², ms= 100 kg, me= 5.97*10²⁴ kg, and

res=  4 *re = 4*6.37*10⁶ m.

Replacing all these known values in (1), we get the value of W:

W =(( 6.67*5.97/(4*6.37)²) *( 10⁻¹¹ * 10²⁴ /10¹²) )* 100 N = 61.3 N

The satellite's weight at the altitude of its orbit is;

61.31 N

Formula for gravitational force is;

F = GMm/R²

Where;

G is gravitational constant = 6.67 × 10⁻¹¹ N.m²/kg²

m is mass of earth = 5.97 × 10²⁴ kg

M is mass of satellite = 100 kg

Now, we are told that the altitude is 3R above the Earth's surface.

At the Earth's surface, the distance from the Earth's center is R where R is radius of earth.

Thus, total altitude from the Earth's center to the satellite it (3R + R) = 4R

Thus;

F = GMm/(4R)²

Where R is radius of earth = 6371 × 10⁶ m

Thus;

F = (6.67 × 10⁻¹¹ × 100 × 5.97 × 10²⁴)/(4 × 6371 × 10⁶)

F = 61.31 N

Now, from Newton's second law of motion, we know that the force is equal to the weight.

Thus;

Weight = 61.31 N

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Answer:

Yes.

Explanation:

A sitting elephant has zero kinetic energy. A flying bird have some kinetic energy due to its motion. Regardless of their size, a moving object has always more kinetic energy than an object at rest.

Answer:

a. λ = 647.2 nm

b. I₀  9.36 x 10⁻⁵

Explanation:

Given:

β = 56.0 rad , θ = 3.09 ° , γ = 0.170 mm = 0.170 x 10⁻³ m

a.

The wavelength of the radiation can be find using

β = 2 π / γ * sin θ

λ = [ 2π * γ * sin θ ] / β

λ = [ 2π * 0.107 x 10⁻³m * sin (3.09°) ] / 56.0 rad

λ = 647.14 x 10⁻⁹ m  ⇒  λ = 647.2 nm

b.

The intensity of the central maximum I₀

I = I₀ (4 / β² ) * sin ( β / 2)²

I = I₀ (4 / 56.0²) * [ sin (56.0 /2) ]²

I = I₀  9.36 x 10⁻⁵

To find the wavelength of the radiation and the intensity at a specific point in a single-slit diffraction pattern, we can use formulas and calculations based on the given information.

To find the wavelength of the radiation, we can use the formula for single-slit diffraction:

sin(θ) = mλ/w

Where θ is the angle from the center of the central maximum, m is the order of the bright fringe (m = 1 for the first bright fringe), λ is the wavelength, and w is the width of the slit. Rearranging the formula, we get:

λ = wsin(θ)/m

Plugging in the values, we have:

λ = (0.107 mm)(sin(3.09°))/(1)

Calculating this gives us the wavelength of the radiation.

To find the intensity at the given point, we can use the formula for intensity in single-slit diffraction:

I/I0 = (sin(θ)/θ)2

The given point is at an angular distance of 3.09°, so we can use this formula to calculate the intensity.

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Answer:v=10.84 m/s

Explanation:

Given

mass of Cylinder [tex]m=3 kg[/tex]

height of cylinder [tex]h=6 m[/tex]

It is given that tube is evacuated so we can neglect air resistance so friction provided by the air is zero.

Since Energy cannot be destroyed but can be transformed from one form to another therefore Potential Energy of Cylinder is converted to Kinetic Energy of Cylinder

Potential Energy[tex]=mgh=3\times 9.8\times 6=176.4 J[/tex]

Kinetic Energy [tex]=\frac{1}{2}mv^2=\frac{1}{2}\times 3\times (v)^2[/tex]

[tex]176.4=\frac{1}{2}\times 3\times (v)^2[/tex]

[tex]v=\sqrt{117.6}[/tex]

[tex]v=10.84 m/s[/tex]

Speed of cylinder after the cylinder has fallen 6 m is 11 meter/second.

What information do we have?

Mass of cylinder = 3 kg

Height = 6 m

Using energy conservation theroy

mgh = (1/2)mv²

gh = (1/2)v²

(9.8)(6) = (1/2)v²

Velocity = 11 m/s (Approx.)

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Answer:

The correct answer is the speed accuracy decreases

Explanation:

Before examining the final statements, let's review the uncertainty principle

       Δx  Δp> = h ’/ 2

       h ’= h / 2π

This is because the process of measuring one quantity affects the measurement of the other.

Let's review the claims

The speed of the particle is proportional to the moment

           p = mv

Therefore, if the position is measured more accurately (x) the accuracy of p must decrease

        Δp = h ’/ 2 Δx

The correct answer is the speed accuracy decreases

According to the Heisenberg uncertainty principle in physics, if the accuracy in measuring a particle's position increases, the accuracy in measuring its velocity decreases. This is a fundamental characteristic of the quantum world due to the wave-particle duality of matter.

The question refers to the Heisenberg uncertainty principle in physics, particularly quantum mechanics. This principle states that the more precisely the position of a particle is known, the less precisely its velocity (or momentum, to be more specific) can be known, and vice versa. Therefore, if the accuracy of measuring a particle's position increases, then the accuracy in measuring its velocity decreases.

This phenomenon isn't due to measurement techniques or technology. It's a fundamental limit defined by the nature of the quantum world. It derives from the wave-particle duality of matter, which means small particles like electrons behave both as particles and waves. If we measure the position very precisely, the particle acts more like a wave with an uncertain speed. Conversely, if we measure the speed very precisely, the particle acts more like a particle with an uncertain position.

For example, if we use an extremely short-wavelength electron probe to measure an electron's position, we'd be very accurate but massively disturb the electron's velocity in the process. Hence, increasing the precision in position measurement increases the uncertainty in velocity measurement.

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The amplitude of Maxwell's displacement current flowing across the gap between the plates of the capacitor is 1.753 x 10^-7 A.

The amplitude of Maxwell's displacement current flowing across the gap between the plates of this capacitor can be determined using the formula for the displacement current, which is given by ID = ε0AdV/dt, where ε0 is the permittivity of free space, A is the area of the capacitor plates, and dV/dt is the rate of change of voltage with respect to time.

In this case, the area A of the circular plates is equal to πa^2, where a is the radius of the plates. Therefore, A = π(0.01 m)^2 = 0.000314 m^2. The rate of change of voltage can be obtained from the equation V(t) = V0sin(2πft), where V0 is the amplitude of the voltage, f is the frequency, and t is the time.

Substituting the given values V0 = 10 V and f = 100 Hz into the equation, we have V(t) = 10sin(2π(100)t). Differentiating this equation with respect to time gives dV/dt = 2000πcos(2π(100)t). Plugging in the value of t = 0 (for maximum displacement current) into the equation, we find that cos(2π(100)(0)) = cos(0) = 1.

Therefore, the amplitude of the Maxwell's displacement current ID is given by ID = (8.85 x 10^-12 F/m)(0.000314 m^2)(2000π)(1) = 1.753 x 10^-7 A.

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Answer:

D) True. the protostar rotates more quickly.

Explanation:

If the system is isolated, the angular momentum must be retained.

Initial

        L₀ = I w₀

Final

       [tex]L_{f}[/tex] = [tex]I_{f}[/tex]  [tex]w_{f}[/tex]

      L₀ = [tex]L_{f}[/tex]

      I w₀ = [tex]I_{f}[/tex][tex]w_{f}[/tex]

     [tex]w_{f}[/tex]  = I /[tex]I_{f}[/tex] w₀

In general, the radius of the cloud decreases significantly to form the star, the moment of inertia must decrease, so the angular velocity must increase

Let's examine the answers

A) False. The opposite happens

B) False. Speed ​​changes

C) False. For this there must be an external force, which does not exist

D) True. You agree with the above

Final answer:

The correct answer to the question of what occurs to a protostar as it contracts due to the 'conservation of angular momentum' is that the protostar rotates more quickly (d). This is analogous to a figure skater pulling their arms in to spin faster and is supported by observations of star-forming regions like the Orion Nebula.

Explanation:

Stars form from clouds of gas and dust. As these clouds collapse under their own gravity, they form protostars, which spin due to the conservation of angular momentum. Conservation of angular momentum dictates that as the radius of a spinning object decreases, its rotation speed must increase to conserve angular momentum. This concept is similar to a figure skater who spins faster when they pull their arms in. Therefore, when a protostar gravitationally contracts within its parent cloud, it rotates more quickly because as it shrinks, the protostar's rate of spin increases to conserve angular momentum.

This increase in rotation speed results in the formation of a spinning accretion disk around the equator, which is easier to observe in some regions, such as the Orion Nebula or the Taurus star-forming region. Observations from telescopes like the Hubble Space Telescope support this understanding of the role of angular momentum in star formation. In conclusion, the correct answer to the question is (d) the protostar rotates more quickly.

Answer:

30643 J

Explanation:

[tex]\mu_0[/tex] = Vacuum permeability = [tex]4\pi \times 10^{-7}\ H/m[/tex]

t = Time taken = 1 ns

c = Speed of light = [tex]3\times 10^8\ m/s[/tex]

[tex]E_0[/tex] = Maximum electric field strength = [tex]1.52\times 10^{11}\ V/m[/tex]

A = Area = [tex]1\ mm^2[/tex]

Magnitude of magnetic field is given by

[tex]B_0=\dfrac{E_0}{c}\\\Rightarrow B_0=\dfrac{1.52\times 10^{11}}{3\times 10^8}\\\Rightarrow B_0=506.67\ T[/tex]

Intensity is given by

[tex]I=\dfrac{cB_0^2}{2\mu_0}\\\Rightarrow I=\dfrac{3\times 10^8\times 506.67^2}{2\times 4\pi \times 10^{-7}}\\\Rightarrow I=3.0643\times 10^{19}\ W/m^2[/tex]

Power, intensity and time have the relation

[tex]E=IAt\\\Rightarrow E=3.0643\times 10^{19}\times 1\times 10^{-6}\times 1\times 10^{-9}\\\Rightarrow E=30643\ J[/tex]

The energy it delivers is 30643 J

The magnitude of the friction force acting on the ketchup bottle is 0.84 N, and it is directed opposite to the initial velocity of the bottle.

The friction force acting on the ketchup bottle can be determined using the equation:

Friction force = Mass x Acceleration

Since the bottle comes to rest, its final velocity is 0 m/s and the acceleration can be calculated using the equation:

Acceleration = (Final Velocity - Initial Velocity) / Time

By substituting the given values, we find that the friction force acting on the bottle is 0.30 kg x (-2.8 m/s) / (1.0 m/s^2) = -0.84 N. The negative sign indicates that the friction force is acting in the opposite direction of the initial velocity, which is in the direction of the attendant's hand.

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Answer:

a) W =  900   J.  b) Q =  3142.8   J . c) ΔU =  2242.8   J. d) W = 0. e) Q =   2244.78   J.  g) Δ U  =  0.

Explanation:

(a) Work done by the gas during the initial expansion:

The work done W for a thermodynamic constant pressure process is given as;

W  =  p Δ V

where  

p  is the pressure and  Δ V  is the change in volume.

Here, Given;

P 1 = i n i t i a l  p r e s s u r e  =  2.5 × 10^ 5   P a

T 1 = i n i t i a l   t e m p e r a t u r e  =  360   K

n = n u m b er   o f   m o l e s  =  0.300  m o l  

The ideal gas equation is given by  

P V = nRT

where ,

p  =  absolute pressure of the gas  

V =  volume of the gas  

n  =  number of moles of the gas  

R  =  universal gas constant  =  8.314   K J / m o l   K

T  =  absolute temperature of the gas  

Now we will Calculate the initial volume of the gas using the above equation as follows;

PV  =  n R T

2.5 × 10 ^5 × V 1  =  0.3 × 8.314 × 360

V1 = 897.91 / 250000

V 1  =  0.0036   m ^3  = 3.6×10^-3 m^3

We are also given that

V 2  =  2× V 1

V2 =  2 × 0.0036

V2 =  0.0072   m^3  

Thus, work done is calculated as;

W  =  p Δ V  = p×(V2 - V1)

W =  ( 2.5 × 10 ^5 ) ×( 0.0072  −  0.0036 )

W =  900   J.

(b) Heat added to the gas during the initial expansion:

For a diatomic gas,

C p  =  7 /2 ×R

Cp =  7 /2 × 8.314

Cp =  29.1  J / mo l K  

For a constant pressure process,  

T 2 /T 1  =  V 2 /V 1

T 2  =  V 2 /V 1 × T 1

T 2  =  2 × T 1  = 2×360

T 2  =  720  K

Heat added (Q) can be calculated as;  

Q  =  n C p Δ T  = nC×(T2 - T1)

Q =  0.3 × 29.1 × ( 720  −  360 )

Q =  3142.8   J .

(c) Internal-energy change of the gas during the initial expansion:

From first law of thermodynamics ;

Q  =  Δ U + W

where ,

Q is the heat added or extracted,

Δ U  is the change in internal energy,

W is the work done on or by the system.

Put the previously calculated values of Q and W in the above formula to calculate  Δ U  as;

Δ U  =  Q  −  W

ΔU =  3142.8  −  900

ΔU =  2242.8   J.

(d) The work done during the final cooling:

The final cooling is a constant volume or isochoric process. There is no change in volume and thus the work done is zero.

(e) Heat added during the final cooling:

The final process is a isochoric process and for this, the first law equation becomes ,

Q  =  Δ U  

The molar specific heat at constant volume is given as;

C v  =  5 /2 ×R

Cv =  5 /2 × 8.314

Cv =  20.785  J / m o l   K

The change in internal energy and thus the heat added can be calculated as;  

Q  = Δ U  =  n C v Δ T

Q =  0.3 × 20.785 × ( 720 - 360 )

Q =   2244.78   J.

(f) Internal-energy change during the final cooling:

Internal-energy change during the final cooling  is equal to the heat added during the final cooling Q  =  Δ U  .

(g) The internal-energy change during the isothermal compression:

For isothermal compression,

Δ U  =  n C v Δ T

As their is no change in temperature for isothermal compression,  

Δ T = 0 ,  then,

Δ U  =  0.

During the initial expansion, the gas performed 900 J of work, absorbed 3142.8 J of heat, resulting in a change in internal energy of 2242.8 J. In subsequent processes, work and internal energy changes were determined, culminating in an isothermal compression with no internal energy change.

(a) Work done by the gas during the initial expansion:

The work done (W) for a thermodynamic constant pressure process is given by W = P ΔV, where P is the pressure and ΔV is the change in volume.

Given:

P₁ = initial pressure = 2.5 × 10^5 Pa

T₁ = initial temperature = 360 K

n = number of moles = 0.300 mol

The ideal gas equation is PV = nRT, where P is the absolute pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the universal gas constant (8.314 kJ/mol·K), and T is the absolute temperature of the gas.

Calculate the initial volume of the gas:

P₁V₁ = nRT₁

(2.5 × 10^5) × V₁ = 0.3 × 8.314 × 360

V₁ = (0.3 × 8.314 × 360) / (2.5 × 10^5)

V₁ = 0.0036 m³ = 3.6 × 10⁻³ m³

Given V₂ = 2 × V₁:

V₂ = 2 × 0.0036

V₂ = 0.0072 m³

Now, calculate the work done:

W = P ΔV = (2.5 × 10^5) × (0.0072 - 0.0036)

W = 900 J

(b) Heat added to the gas during the initial expansion:

For a diatomic gas, Cp = (7/2)R, where Cp is the molar heat capacity at constant pressure.

Cp = (7/2) × 8.314

Cp = 29.1 J/mol·K

For a constant pressure process, T₂/T₁ = V₂/V₁:

T₂ = (V₂/V₁) × T₁

T₂ = 2 × T₁ = 2 × 360 = 720 K

Heat added (Q) can be calculated as:

Q = nCpΔT = 0.3 × 29.1 × (720 - 360)

Q = 3142.8 J

(c) Internal-energy change of the gas during the initial expansion:

From the first law of thermodynamics Q = ΔU + W, where Q is the heat added or extracted, ΔU is the change in internal energy, and W is the work done on or by the system.

ΔU = Q - W = 3142.8 - 900

ΔU = 2242.8 J

(d) The work done during the final cooling:

The final cooling is a constant volume (isochoric) process, so there is no change in volume (ΔV = 0), and thus the work done is zero.

(e) Heat added during the final cooling:

For an isochoric process, Q = ΔU. The molar specific heat at constant volume is Cv = (5/2)R.

Cv = (5/2) × 8.314 = 20.785 J/mol·K

The change in internal energy and thus the heat added can be calculated as:

Q = ΔU = nCvΔT = 0.3 × 20.785 × (720 - 360)

Q = 2244.78 J

(f) Internal-energy change during the final cooling:

The internal-energy change during the final cooling is equal to the heat added during the final cooling, so ΔU = Q.

(g) The internal-energy change during the isothermal compression:

For isothermal compression, ΔU = 0 since there is no change in temperature (ΔT = 0).

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Answer:

Voltage, V = 450 volts

Explanation:

It is given that,

Separation between plates, d = 3 mm = 0.003 m        

magnitude of magnetic field, B = 0.3 T

Speed of the particle, [tex]v=5\times 10^5\ m/s[/tex]

The relation between the magnetic field, electric field and the velocity of the particle is given by :

[tex]v=\dfrac{E}{B}[/tex]

Also, [tex]E=\dfrac{V}{d}[/tex]

[tex]v=\dfrac{V}{Bd}[/tex]

[tex]V=vBd[/tex]

[tex]V=5\times 10^5\times 0.3\times 0.003[/tex]

V = 450 volts

So, the voltage between the plates will be 450 V. Hence, this is the required solution.

Answer:

6230.49413 J

0 J

0.63998

Explanation:

F = Force = 40 N

[tex]\theta[/tex] = Angle = 52°

Work done is given by

[tex]W=Fscos50\\\Rightarrow W=40\times 253\times cos52\\\Rightarrow W=6230.49413\ J[/tex]

The work she does on the flight bag is 6230.49413 J

The work done on the flight bag will be the opposite of the work done by the flight attendant

[tex]W=-6230.49413\ J[/tex]

So net work will be

[tex]W_n=6230.49413-6230.49413\\\Rightarrow W_n=0[/tex]

The net work done on the flight bag is 0 J

Coefficient of friction is given by

[tex]\mu=\dfrac{F_f}{F_N}\\\Rightarrow \mu=\dfrac{F_f}{F_g-F_{app}}\\\Rightarrow \mu=\dfrac{40cos52}{70-40sin52}\\\Rightarrow \mu=0.63998[/tex]

The coefficient of friction is 0.63998

(a)  The work done by the attendant on the flight bag is 6230.49 J.

(b)  The work on the flight bag is 0 J .

(c)  The coefficient of kinetic friction between the flight bag and the floor is 0.35.

Given data:

The weight of flight bag is, W = 70.0 N.

The distance covered by the bag is, d = 253 m.

The magnitude of force exerted on bag is, F = 40.0 N.

The angle of inclination with horizontal is, [tex]\theta =52^{\circ}[/tex].

Work done defined as the product of force and distance covered due to applied force.

(a)

The work done on the flight bag is given as,

[tex]W'=F \times dcos\theta[/tex]

Solving as,

[tex]W'=40 \times 253cos52\\W'=6230.49 \;\rm J[/tex]

Thus, the work done by the attendant on the flight bag is 6230.49 J.

(b)

The work done on the flight bag will be the opposite of the work done by the flight attendant. So,

W'' = - W

W'' = - 6230.49 J

Then net work done on the flight bag is,

[tex]W_{net}=W'+W''\\W_{net}=6230.49 - 6230.49\\W_{net}=0[/tex]

Thus, the net work on the flight bag is 0 J .

(c)

The expression for the frictional force is given as,

[tex]f = \mu \times W[/tex]

[tex]\mu[/tex] is the coefficient of kinetic friction. And the frictional force is due to the horizontal component of applied force. Then,

[tex]f=Fcos\theta[/tex]

So,

[tex]Fcos\theta= \mu \times W\\\\40 \times cos52=\mu \times 70\\\\\mu=\dfrac{40 \times cos52}{70} \\\\\mu = 0.35[/tex]

Thus, the coefficient of kinetic friction between the flight bag and the floor is 0.35.

Learn more about the friction here:

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Final answer:

The statement that two electrons in the same atom with the same four quantum numbers must have the same energy is false.

Explanation:

The statement that two electrons in the same atom with the same four quantum numbers must have the same energy is false. The Pauli exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers. The four quantum numbers are the principal quantum number (n), the angular momentum quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

Since the quantum numbers determine the energy and other properties of the electrons, if two electrons in the same atom have the same set of quantum numbers, they must have different spins in order to obey the Pauli exclusion principle. Therefore, they would have different energies.

To solve this problem it is necessary to apply the concepts related to energy conservation.

In this case the kinetic energy is given as

[tex]KE = \frac{1}{2} mv^2[/tex]

Where,

m = mass

v= Velocity

In the case of heat lost energy (for all 4 wheels) we have to

[tex]Q = mC_p \Delta T \rightarrow 4Q = 4mC_p \Delta T[/tex]

m = mass

[tex]C_p =[/tex] Specific Heat

[tex]\Delta T[/tex]= Change at temperature

For conservation we have to

[tex]KE = Q[/tex]

[tex]\frac{1}{2} mv^2 = 4mC_p \Delta T[/tex]

[tex]\Delta T = \frac{1}{2}\frac{mv^2}{4mC_p}[/tex]

[tex]\Delta T = \frac{1}{2}\frac{(1500)(30)^2}{4(8)(448)}[/tex]

[tex]\Delta T = 47.084\°C \approx 47\°C[/tex]

Therefore the temperature rises in each of the four brake drums around to 47°C

Answer:

A) The wave equation is defined as

[tex]y(x,t) = A\cos(kx + \omega t)=0.0275\cos(0.0041x + 6.2t)\\[/tex]

Using the wave equation we can deduce the wave number and the angular velocity. k = 0.0041 and ω = 6.2.

The time it takes for one complete wave pattern to go past a fisherman is period.

[tex]\omega = 2\pi f\\ f = 1/ T[/tex]

T = 1.01 s.

The horizontal distance the wave crest traveled in one period is

[tex]\lambda = 2\pi / k = 2\pi / 0.0041 = 1.53\times 10^3~m[/tex]

[tex]y(x = \lambda,t = T) = 0.0275\cos(0.0041*1.53*\10^3 + 6.2*1.01) = 0.0275~m[/tex]

B) The wave number, k = 0.0041 . The number of waves per second is the frequency, so f = 0.987.

C) A wave crest travels past the fisherman with the following speed

[tex]v = \lambda f = 1.53\times 10^3 * 0.987 = 1.51\times 10^3~m/s[/tex]

The maximum speed of the cork floater can be calculated as follows.

The velocity of the wave crest is the derivative of the position with respect to time.

[tex]v(x,t) = \frac{dy(x,t)}{dt} = -(6.2\times 0.0275)\sin(0.0041x + 6.2t)[/tex]

The maximum velocity can be found by setting the derivative of the velocity to zero.

[tex]\frac{dv_y(x,t)}{dt} = -(6.2)^2(0.0275)\cos(0.0041*1.53\times 10^3 + 6.2t) = 0[/tex]

In order this to be zero, cosine term must be equal to zero.

[tex]0.0041*1.53\times 10^3 + 6.2t = 5\pi /2\\t = 0.255~s[/tex]

The reason that cosine term is set to be 5π/2 is that time cannot be zero. For π/2 and 3π/2, t<0.

[tex]v(x=\lambda, t = 0.255) = -(6.2\times0.0275)\sin(0.0041\times 1.53\times 10^3 + 6.2\times 0.255) = -0.17~m/s[/tex]

(a) The time taken "1.013 s".

(b) Number of waves "0.987 Hz".

(c) Maximum speed "0.1750 m/s".

A further explanation is below.

Given:

(a)

The time taken will be:

→ [tex]T = \frac{2 \pi}{W}[/tex]

      [tex]= \frac{2 \pi}{6.20}[/tex]

      [tex]= 1.013 \ s[/tex]

The covered horizontal distance will be:

→ [tex]\lambda = \frac{2 \pi}{K}[/tex]

     [tex]= \frac{2 \pi}{0.410}[/tex]

     [tex]= 15.3 \ cm[/tex]

(b)

Wave number,

The number of waves per second will be:

→ [tex]f = \frac{1}{T}[/tex]

     [tex]= \frac{1}{1.013}[/tex]

     [tex]= 0.987 \ Hz[/tex]

(c)

The speed in which the wave crest travel will be:

→ [tex]v = f \lambda[/tex]

      [tex]= 15.3\times 0.987[/tex]

      [tex]= 15.1 \ cm/s \ or \ 0.151 \ m/s[/tex]

and,

The maximum speed of the cork floater will be:

→ [tex]v_1 = AW[/tex]

      [tex]=2.75\times 6.20[/tex]

      [tex]= 0.1750 \ m/s[/tex]

Thus the above answers are correct.

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Answer:

(a)spring effective force constant =1568N/cm

(b) Yes

Explanation:

Hooke's law is represented mathematically as, F=ke

where

(a).After the maximum load is exceeded, Hooke's law doesn't apply anymore. from the problem, its stated that a maximum load of 120kg will cause an extension of 0.75cm, we will use this to determine the spring constant.

F=mg, g=9.8[tex]m/s^{2}[/tex]

F= 120*9.8 =1176N

From Hooke's law, k=[tex]\frac{F}{e}[/tex]

k=[tex]\frac{1176}{0.75}[/tex]

k=1568N/cm

(b). The players who stands on the scale causes a 0.48cm extension.

    e= 0.48cm, k= 1568N/cm

F=Ke

F= 1568*0.48

F= 752.64N

To calculate the mass of the player we divide this force by g=9.8[tex]m/s^{2}[/tex]

F=mg

m=F/g

[tex]m= \frac{ 752.64}{9.8} \\\\m=76.8kg[/tex]

since the rugby team is an under 85kg team, this player with 76.8kg mass is eligible

Answer:

The peak value of current will be 2.828 A.

Explanation:

Given that

Value of RMS current I(rms) = 2 A

Lets take peak current = I(p)

As we know that relationship between RMS and peak current given as

[tex]I(rms)=\dfrac{I(p)}{\sqrt2}[/tex]

Now by putting the values in the above equation

[tex]I(rms)=\dfrac{I(p)}{\sqrt2}[/tex]

[tex]2\ A=\dfrac{I(p)}{\sqrt2}[/tex]

[tex]I(p)=2\sqrt2[/tex]

As we know that

[tex]\sqrt{2}=1.414[/tex]

Therefore

I(p)=2.828 A

The peak value of current will be 2.828 A.

Answer:

(a) -202 m/s²

(b) 198 m

Explanation:

Given data

[tex]\frac{632mi}{h} .\frac{1609.34m}{1mi} .\frac{1h}{3600s} =283m/s[/tex]

(a) The acceleration (a) is the change in the speed over the time elapsed.

a = (vf - v₀)/t = (0 - 283 m/s)/ 1.40s = -202 m/s²

(b) We can find the distance traveled (d) using the following kinematic expression.

y = v₀ × t + 1/2 × a × t²

y = 283 m/s × 1.40 s + 1/2 × (-202 m/s²) × (1.40 s)²

y = 198 m

Answer:

Initial:   bar  power U₀

Final:    bar  power U = U₀ / 2

             bar Kinetic energy  K = U₀ / 2

These two bars are half the height of the initial bar

Explanation:

To know which graph is correct, let's discuss the solution to the problem

Initial mechanical energy

      Em₀ = U₀ = m g H

The mechanical energy at the midpoint

     Em₂ = K + U₂

As there is no friction, mechanical energy is conserved

     Em₀ = Em₂

     U₀ = K + U₂

     K = U₀ - U₂

     K = m g (H - y₂)

Indicates that position 2 corresponds to y₂ = H / 2

     K = m g (H –H / 2)

     K = ½ m g H

     K = ½ Uo

Therefore the graph must be

Initial:   bar  power U₀

Final:    bar  power U = U₀ / 2

             bar Kinetic energy  K = U₀ / 2

These two bars are half the height of the initial bar

Answer: B&C

Explanation:

Release point: Ug bar graph only K none

Halfway point: Ug and K are equal bar graph

second option,

Release point: empty graph

Halfway point: Ug down half K up half

Answer:

Re = 1 10⁴

Explanation:

Reynolds number is

         Re = ρ v D /μ

The units of each term are

       ρ = [kg / m³]

       v = [m / s]

      D = [m]

      μ = [Pa s]

The pressure

      Pa = [N / m²] = [Kg m / s²] 1 / [m²] = [kg / m s²]

      μ = [Pa s] = [kg / m s²] [s] = [kg / m s]

We substitute the units in the equation

      Re = [kg / m³] [m / s] [m] / [kg / m s]

      Re = [kg / m s] / [m s / kg]

      RE = [ ]

Reynolds number is a scalar

Let's evaluate for the given point

Where the data for methane are:

viscosity       μ = 11.2 10⁻⁶ Pa s

the density  ρ = 0.656 kg / m³

       D = 2 in (2.54 10⁻² m / 1 in) = 5.08 10⁻² m

       Re = 0.656 4 2 5.08 10⁻² /11.2 10⁻⁶

       Re = 1.19 10⁴

The Reynolds number is a key parameter in fluid mechanics that signals laminar or turbulent flow. It is a dimensionless quantity determined by fluid properties and flow characteristics.

The Reynolds number, a dimensionless parameter, indicates whether flow is laminar or turbulent in fluid mechanics. It is defined as Re = rho VD/mu, where rho is the fluid density, V is the velocity, D is the diameter, and mu is the fluid viscosity. The value of Reynolds number for methane flowing at 4 m/s through a 2-in-diameter pipe is calculated using this formula.

Answer : This reaction occur spontaneously at temperature above in kelvins is, 340 K

Explanation : Given,

[tex]\Delta H[/tex] = 17 KJ/mole = 17000 J/mole

[tex]\Delta S[/tex] = 50 J/mole.K

Gibbs–Helmholtz equation is :

[tex]\Delta G=\Delta H-T\Delta S[/tex]

As per question the reaction is spontaneous that means the value of [tex]\Delta G[/tex] is negative or we can say that the value of [tex]\Delta G[/tex] is less than zero.

[tex]\Delta G<0[/tex]

The above expression will be:

[tex]0>\Delta H-T\Delta S[/tex]

[tex]T\Delta S>\Delta H[/tex]

[tex]T>\frac{\Delta H}{\Delta S}[/tex]

Now put all the given values in this expression, we get :

[tex]T>\frac{17000J/mole}{50J/mole.K}[/tex]

[tex]T>340K[/tex]

Therefore, this reaction occur spontaneously at temperature above in kelvins is, 340 K

Final answer:

The reaction occurs spontaneously above 340 Kelvin, determined by applying the Gibbs free energy formula (ΔG = ΔH - TΔS) and ensuring the values for ΔH and ΔS are in compatible units.

Explanation:

The question requires us to determine above what temperature a reaction occurs spontaneously, given an enthalpy change (ΔH) of 17 kJ/mol and an entropy change (ΔS) of 50 J/(mol·K). To find this, we use the formula for Gibbs free energy change (ΔG = ΔH - TΔS), where a reaction is spontaneous when ΔG < 0.

First, we need to ensure that both values are in the same units, so we convert ΔH from kJ to J: 17 kJ/mol = 17000 J/mol. Then, we solve for T in the equation ΔG < 0, substituting ΔH and ΔS into the equation:

0 > 17000 J/mol - T(50 J/(mol·K)),

implying T > 17000 J/mol / 50 J/(mol·K) = 340 K.

Therefore, the reaction occurs spontaneously above 340 K.

Answer:

[tex]K_p=139.6\ MeV[/tex]

Explanation:

It is given that,

The rest energy of a pion is 139.6 MeV. Here, two protons having equal kinetic energy collides elastically. We need to find the minimum kinetic energy of one of these protons necessary to make a pion-antipion pair.

It can be calculated using conservation of energy and momentum, the total energy of the particles gets converted into rest mass energy of new particles. So,

[tex]2K_p=2\times E_{\pi^+}[/tex]

[tex]K_p=\times E_{\pi^+}[/tex]

[tex]K_p=139.6\ MeV[/tex]

So, the minimum kinetic energy of one of these protons necessary to make a pion-antipion pair is 139.6 MeV. Hence, this is the required solution.

Answer:

The temperature change of the copper is greater than the temperature change of the water.

Explanation:

deltaQ = mc(deltaT)

Where,

delta T = change in the temperature

m =mass

c = heat capacity

[tex]\frac{(deltaT)_{Cu}}{(deltaT)_{w}}=\frac{4190J/kg.K}{390J/kg.K}\\ \\(deltaT)_{Cu}=10.74(deltaT)_{w}[/tex]

The temperature change in the copper is nearly 11 times the temperature change in the water.

So, the correct option is,

The temperature change of the copper is greater than the temperature change of the water.

Hope this helps!

The temperature change of the copper is equal to the temperature change of the water.

The temperature change of the copper is equal to the temperature change of the water.

When two substances come into contact, heat is transferred between them until they reach thermal equilibrium, where their temperatures are equal. According to the Law of Conservation of Energy, the heat lost by one substance is equal to the heat gained by the other substance. In this case, since all heat transfer occurs between the copper and water, the temperature change of the copper is equal to the temperature change of the water.

To solve this problem we will use the linear motion description kinematic equations. We will proceed to analyze the general case by which the analysis is taken for the second car and the tenth. So we have to:

[tex]x = v_0 t \frac{1}{2} at^2[/tex]

Where,

x= Displacement

[tex]v_0[/tex] = Initial velocity

a = Acceleration

t = time

Since there is no initial velocity, the same equation can be transformed in terms of length and time as:

[tex]L = \frac{1}{2} a t_1 ^2[/tex]

For the second cart

[tex]2L \frac{1}{2} at_2^2[/tex]

When the tenth car is aligned the length will be 9 times the initial therefore:

[tex]9L = \frac{1}{2} at_3^2[/tex]

When the tenth car has passed the length will be 10 times the initial therefore:

[tex]10L = \frac{1}{2}at_4^2[/tex]

The difference in time taken from the second car to pass it is 5 seconds, therefore:

[tex]t_2-t_1 = 5s[/tex]

From the first equation replacing it in the second one we will have that the relationship of the two times is equivalent to:

[tex]\frac{1}{2} = (\frac{t_1}{t_2})^2[/tex]

[tex]t_1 = \frac{t_2}{\sqrt{2}}[/tex]

From the relationship when the car has passed and the time difference we will have to:

[tex](t_2-\frac{t_2}{\sqrt{2}}) = 5[/tex]

[tex]t_2 (\sqrt{2}-1) = 3\sqrt{2}[/tex]

[tex]t_2= (\frac{5\sqrt{2}}{\sqrt{2}-1})^2[/tex]

Replacing the value found in the equation given for the second car equation we have to:

[tex]\frac{L}{a} = \frac{1}{4} (\frac{5\sqrt{2}}{\sqrt{2}-1})^2[/tex]

Finally we will have the time when the cars are aligned is

[tex]18 \frac{1}{4} (\frac{5\sqrt{2}}{\sqrt{2}-1})^2 = t_3^2[/tex]

[tex]t_3 = 36.213s[/tex]

The time when you have passed it would be:

[tex]20\frac{1}{4} (\frac{5\sqrt{2}}{\sqrt{2}-1})^2 = t_4^2[/tex]

[tex]t_4 = 38.172[/tex]

The difference between the two times would be:

[tex]t_4-t_3 = 38.172-36.213 \approx 2s[/tex]

Therefore the correct answer is C.

The passage time for the 10th car in a uniformly accelerating train would be less than 5.0 seconds but not as low as any of the options provided (a to e), as each car passes more quickly than the previous one due to constant acceleration.

The question involves an observer timing how long it takes for individual cars of constant acceleration of a train to pass by. If it took 5.0 seconds for the second car to pass the observer, then the time it takes for the 10th car to pass him is merely the time it took for one car to pass because the train is accelerating at a constant rate, and all cars are of the same length. Considering the train is accelerating uniformly, the passage of each car happens more quickly over time.

Giving this knowledge, for the first car to pass, the train would have started at rest, so it would have taken longer than the second car which had the benefit of the train already moving at a certain velocity. Therefore, we can derive that the time for each subsequent car to pass will be less than 5.0 seconds, which questions the multiple-choice options. Based on this logic, we don't have to calculate the exact passing time for the 10th car, as there are no values given to calculate with, but we can infer that none of the times listed would be correct. Each car would be passing quicker than the last, but it would not be instantaneous; it would be a fraction of the 5 seconds but not as low as any of the times listed from a to e.

Final answer:

We can estimate the power required to tow a banner by using the drag force formula. If the airplane was towing a rigid flat plate, the power required would be different due to a different drag coefficient. The power requirement and drag are larger for the banner due to its higher drag coefficient compared to a flat plate. No calculation can be made for a smooth spherical balloon without the drag coefficient.

Explanation:

(a) To estimate the power required to tow the banner, we can use the formula: Power = Drag force * velocity. The drag force can be calculated using the drag coefficient and the area of the banner. The area is given by multiplying the height (0.8 m) by the length (25 m). The drag force can then be multiplied by the velocity of the plane (150 km/hr converted to m/s) to obtain the power required.

(b) If the plane was towing a rigid flat plate of the same size, the drag coefficient would be different. The power required can be calculated using the new drag coefficient and the same formula as in part (a).

(c) The power requirement and drag are larger for the banner because the drag coefficient for the banner is higher compared to that of a rigid flat plate. This means that the banner experiences more air resistance, requiring more power to tow.

(d) To determine the power required to tow a smooth spherical balloon with a diameter of 2 m, we would need the drag coefficient associated with the balloon. Since it is not provided in the question, we cannot calculate the power required.

Answer:

[tex]\dfrac{1}{28.15432}\ s[/tex]

Explanation:

The factor by which the shutter speed is increased is [tex]\dfrac{7.92}{2.8}[/tex]

Exposure time will be increased by

[tex]f=2^{\dfrac{7.92}{2.8}}=7.1037\ s[/tex]

The proper shutter speed is given by

[tex]\dfrac{1}{T}f=\dfrac{1}{200}\times 2^{\dfrac{7.92}{2.8}}=\dfrac{1}{\dfrac{200}{2^{\dfrac{7.92}{2.8}}}}\\ =\dfrac{1}{28.15432}\ s[/tex]

The proper shutter speed is [tex]\dfrac{1}{28.15432}\ s[/tex]