Answers
Answer:
[tex] v = \frac{2 V}{3}= 0.667 v[/tex]
Since we have identical diodes we can use the equation:
[tex] I_D =I= I_S e^{\frac{V_D}{V_T}}[/tex]
And replacing we have:[tex]I = 10^{-14} A e^{\frac{0.667}{0.025}}= 3.86x10^{-3} A = 3.86 mA[/tex]
Since we know that 1 mA is drawn away from the output then the real value for I would be
[tex] I_D = I = 3.86 mA -1 mA= 2.86 mA[/tex]
And for this case the value for [tex] v_D[/tex] would be:
[tex] V_D = V_T ln (\frac{I_D}{I_T})= 0.025 ln (\frac{0.0029}{10^{-14}})= 0.660 V[/tex]
And the output votage on this case would be:
[tex] V = 3 V_D = 3 *0.660 V = 1.98 V[/tex]
And the net change in the output voltage would be:
[tex] \Delta V = |2 v-1.98 V| = |0.02 V |= 20 m V[/tex]
Explanation:
For this case we have the figure attached illustrating the problem
We know that the equation for the current in a diode id given by:
[tex] I_D = I_s [e^{\frac{V_D}{V_T}} -1] \approx I_S e^{\frac{V_D}{V_T}}[/tex]
For this case the voltage across the 3 diode in series needs to be 2 V, and we can find the voltage on each diode [tex] v_1 + v_2 + v_3= 2[/tex] and each voltage is the same v for each diode, so then:
[tex] v = \frac{2 V}{3}= 0.667 v[/tex]
Since we have identical diodes we can use the equation:
[tex] I_D =I= I_S e^{\frac{V_D}{V_T}}[/tex]
And replacing we have:
[tex]I = 10^{-14} A e^{\frac{0.667}{0.025}}= 3.86x10^{-3} A = 3.86 mA[/tex]
Since we know that 1 mA is drawn away from the output then the real value for I would be
[tex] I_D = I = 3.86 mA -1 mA= 2.86 mA[/tex]
And for this case the value for [tex] v_D[/tex] would be:
[tex] V_D = V_T ln (\frac{I_D}{I_T})= 0.025 ln (\frac{0.0029}{10^{-14}})= 0.660 V[/tex]
And the output votage on this case would be:
[tex] V = 3 V_D = 3 *0.660 V = 1.98 V[/tex]
And the net change in the output voltage would be:
[tex] \Delta V = |2 v-1.98 V| = |0.02 V |= 20 m V[/tex]
Related Questions
A charged particle isinjected into a uniform magnetic field such that its velocityvector is perpendicular to themagnetic field vector. Ignoring the particle's weight, the particlewill
A) follow a spiralpath.
B) move in a straight line.
C) move along a parabolic path.
D)follow a circular path.
Answers
A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will follow a circular path.
Option D
Explanation:
Magnetic force causes charged particles to move in spiral paths. The Particle accelerators keep the protons to follow circular paths when it is in the magnetic field. Velocity has a change in direction but magnitude remains the same when this condition exists.
The magnetic force exerted on the charged particle is given by the formula:
[tex]F=q v B \sin \theta[/tex]
where
q is the charge
v is the velocity of the particle
B is the magnetic field
[tex]\theta[/tex] is the angle
In this problem, the velocity is perpendicular to the magnetic field vector, hence
[tex]\theta[/tex] = [tex]90^{\circ}[/tex] and sin[tex]\boldsymbol{\theta}[/tex] =sin 90 degree = 1.
So applying the formula,
the force is simply [tex]F=q v B[/tex]
Also, the force is perpendicular to both B and v and so according to the right-hand rule, we have:
a force that is always perpendicular to the velocity, va force which is constant in magnitude (because the magnitude of v or B does not change)This means that the force acts as a centripetal force, so it will keep the charged particle in a uniform circular motion.
A rectangular coil 20 cm by 33 cm has 110 turns. This coil produces a maximum emf of 72 V when it rotates with an angular speed of 200 rad/s in a magnetic field of strength B.Find the value of B.
Answers
Answer:
0.05T
Explanation:
Data given,
area, A=20cm*33cm=0.2m*0.33m=0.066m^2
Number of turns, N=110 turns,
Emf= 72v,
angular speed, W= 200rad/s
magnetic field strength, B= ??
from the expression showing the relationship between induced emf and magnetic field is shown below
[tex]E=NBAW[/tex]
Where N is the number of turns,
E=is the emf,
Bis the magnetic field strength
if we substitute values, we arrive at
[tex]E=NABW\\72=110*0.066*B*200\\B=\frac{72}{1452}\\ B=0.05T[/tex]
Explanation:
Below is an attachment containing the solution.
g A current loop, carrying a current of 5.6 A, is in the shape of a right triangle with sides 30, 40, and 50 cm. The loop is in a uniform magnetic field of magnitude 62 mT whose direction is parallel to the current in the 50 cm side of the loop. Find the magnitude of (a) the magnetic dipole moment of the loop in amperes-square meters and (b) the torque on the loop.
Answers
Answer:
(a) 0.336 A m²
(b) 0 Nm
Explanation:
(a) Magnetic dipole moment, μ, is given by
[tex]\mu = IA[/tex]
I is the current in the loop and A is the area of the loop.
The loop is a triangle. To find its area, observe that the dimensions form a Pythagorean triple, making it a right-angled triangle with base and height of 30 cm and 40 cm.
[tex]A = \frac{1}{2}\times(0.3\text{ m})\times(0.4\text{ m})=0.06\text{ m}^2[/tex]
[tex]\mu = (5.6\text{ A})(0.06\text{ m}^2) = 0.336\text{ A}\,\text{m}^2[/tex]
(b) Torque is given by
[tex]\tau = \mu B\sin\theta[/tex]
where B is the magnetic field and [tex]\theta[/tex] is the angle between the loop and the magnetic field. Since the field is parallel, [tex]\theta[/tex] is 0.
[tex]\tau = \mu B\sin0 = 0\text{ Nm}[/tex]
The three forces (in units of N) given below are acting on a 20 kg mass. Calculate the magnitude of the acceleration of the mass. stack F subscript 1 with rightwards harpoon with barb upwards on top equals 3 i with hat on top space space space space space stack F subscript 2 with rightwards harpoon with barb upwards on top equals 5 j with hat on top space space space space stack F subscript 3 with rightwards harpoon with barb upwards on top equals open parentheses i with hat on top minus 3 j with hat on top close parentheses space space A. 0.2 m/s^2 B. 0.224 m/s^2 C. 0.1 m/s^2 D. 1.0 m/s^2
Answers
Answer:
B. 0.224 m/s²
Explanation:
Given:
Mass of the object (m) = 20 kg
The forces acting on the object are:
[tex]\vec{F_1}=3\vec{i}\ N\\\\\vec{F_2}=5\vec{j}\ N\\\\\vec{F_3}=(\vec{i}-3\vec{j})\ N[/tex]
Now, the net force acting on the object is equal to the vector sum of the forces acting on it. Therefore,
[tex]\vec{F_{net}}=\vec{F_1}+\vec{F_2}+\vec{F_3}\\\\\vec{F_{net}}=3\vec{i}+5\vec{j}+\vec{i}-3\vec{j}\\\\\vec{F_{net}}=(3+1)\vec{i}+(5-3)\vec{j}\\\\\vec{F_{net}}=(4\vec{i}+2\vec{j})\ N[/tex]
Now, the magnitude of the net force is equal to the square root of the sum of the squares of its components and is given as:
[tex]|\vec{F_{net}}|=\sqrt{4^2+2^2}\\\\|\vec{F_{net}}|=\sqrt{20}\ N[/tex]
Now, from Newton's second law, the magnitude of acceleration is equal to the ratio of the magnitude of net force and mass. So,
Magnitude of acceleration is given as:
[tex]|\vec{a}|=\dfrac{|\vec{F_{net}}|}{m}\\\\|\vec{a}|=\frac{\sqrt{20}\ N}{20\ kg}\\\\|\vec{a}|=0.224\ m/s^2[/tex]
Therefore, option (B) is correct.
A voltmeter is connected to the terminals of the battery; the battery is not connected to any other external circuit elements. What is the reading of the voltmeter V? Express your answer in volts. Use three significant figures.
Answers
Answer:
12 volts.
Explanation:
Equal to the emf of battery. internal resistance won't count because the internal resistance is only apparent when a current passes through the battery.
The voltmeter reading is the terminal voltage, which is slightly less than the EMF due to the internal resistance of the battery and the small current drawn by the voltmeter. The exact value in volts is not provided due to the unknown internal resistance.
he deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 100 volt potential difference is suddenly applied to the initially uncharged plates through a 1000 ohm resistor in series with the deflection plates. How long do
Answers
Answer:
Incomplete question
This is the complete question
The deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 100 V potential difference is suddenly applied to the initially uncharged plates through a 1000 Ω resistor in series with the deflection plates. How long does it take for the potential difference between the deflection plates to reach 95 V?
Explanation:
Given that,
The dimension of 10cm by 2cm
0.1m by 0.02m
Then, the area is Lenght × breadth
Area=0.1×0.02=0.002m²
The distance between the plate is d=1mm=0.001m
Then,
The capacitance of a capacitor is given as
C=εoA/d
Where
εo is constant and has a value of
εo= 8.854 × 10−12 C²/Nm²
C= 8.854E-12×0.002/0.001
C=17.7×10^-12
C=17.7 pF
Value of resistor resistance is 1000ohms
Voltage applied is V = 100V
This Is a series resistor and capacitor (RC ) circuit
In an RC circuit, voltage is given as
Charging system
V=Vo[1 - exp(-t/RC)]
At, t=0, V=100V
Therefore, Vo=100V
We want to know the time, the voltage will deflect 95V.
Then applying our parameters
V=Vo[1 - exp(-t/RC)]
95=100[1-exp(-t/1000×17.7×10^-12)]
95/100=1-exp(-t/17.7×10^-9)
0.95=1-exp(-t/17.7×10^-9)
0.95 - 1 = -exp(-t/17.7×10^-9)
-0.05=-exp(-t/17.7×10^-9)
Divide both side by -1
0.05=exp(-t/17.7×10^-9)
Take In of both sides
In(0.05)=-t/17.7×10^-9
-2.996=-t/17.7×10^-9
-2.996×17.7×10^-9=-t
-t=-53.02×10^-9
Divide both side by -1
t= 53.02×10^-9s
t=53.02 ns
The time to deflect 95V is 53.02nanoseconds
Which of the following statements is/are true? Check all that apply.
1) A person's power output limits the amount of work that he or she can do in a given time span.
2) The SI unit of power is the watt.
3) Power can be considered the rate at which energy is transformed.
4) Power can be considered the rate at which work is done.
5) A person's power output limits the total amount of work that he or she can do.
6) The SI unit of power is the horsepower.
Answers
Answer:
The statements which are true are:
1) A person's power output limits the amount of work that he or she can do in a given time span.
2) The SI unit of power is the watt.
4) Power can be considered the rate at which work is done.
Explanation:
Power can be defined as the the rate at which the work is done. Mathematically,
[tex]\large{P = \dfrac{W}{t}}[/tex]
where '[tex]W[/tex]' is the amount of work done in time '[tex]t[/tex]'.
Also one can perform some work in the expense of the energy that he/she consumes. So alternatively power can also be defined as the rate at which the energy is expended.
The SI unit of work done is Joule. So the unit of power in SI system is
[tex]Js^{-1}[/tex] or Watt.
A rectangular tank that is 4 meters long, 3 meters wide and 6 meters deep is filled with a rubbing alcohol that has density 786 kilograms per cubic meter. In each part below, assume that the tank is initially full, and that gravity is 9.8 meters per second squared. Your answers must include the correct units.
(a) How much work is done pumping all of the liquid out over the top of the tank?
(b) How much work is done pumping all of the liquid out of a spout 2 meters above the top of the tank?
(c) How much work is done pumping two-thirds of the liquid out over the top of the tank?
(d) How much work is done pumping two-thirds of the liquid out of a spout 2 meters above the top of the tank?
Answers
The work done pumping the liquid out of the tank relies on the weight of the mass being lifted, the gravity, and the height it is being lifted to. Calculations are given for lifting all the fluid and two-thirds of it to two different heights.
Explanation:To calculate the work done pumping the liquid out of the tank, we first need to find the volume of the tank, which is 4 meters * 3 meters * 6 meters, giving a total of 72 cubic meters of rubbing alcohol. Multiplying this by the density of the alcohol (786 kg/m^3) gives us the total mass of the alcohol, 56,592 kg. The work done by gravity when an object is lifted is equal to the weight of the object (mass*gravity) multiplied by the distance it is lifted (height). Therefore, we can calculate the work done pumping the liquid out of the tank:
(a) The height is 6 m, so the work done is 56,592 kg * 9.8 m/s^2 * 6m = 3,331,723.2 J (b) The height is 8m (6m + 2m), so the work done is 56,592 kg * 9.8 m/s^2 * 8m = 4,442,297.6 J (c) Two thirds of the liquid is 37,728 kg, height is 6m, so the work done is 37,728 kg * 9.8 m/s^2 * 6m = 2,221,148.8 J (d) Two thirds of the liquid is 37,728 kg, height is 8m, so the work done is 37,728 kg * 9.8 m/s^2 * 8m = 2,961,531.2 J. Learn more about Work Done here:
https://brainly.com/question/35917320
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The work done to pump all of the liquid out over the top of the tank is calculated as 1665568.8 J, and 4441516.8 J through a spout 2 meters above the tank. To pump out two-thirds of the liquid over the top, the work is 1109203.2 J, and through the spout, it is 2957875.2 J. Each part uses the weight of the liquid and the distance it needs to be moved to calculate the work done.
Part a :
To find the work done, we need to calculate the force required to move the liquid to the top of the tank and the distance it needs to be moved.
Calculate the volume of the tank:
Volume = length × width × depth = 4 m × 3 m × 6 m = 72 m³.
Calculate the mass of the liquid:
Mass = density × volume = 786 kg/m³ × 72 m³ = 56652 kg.
Calculate the weight of the liquid:
Weight = mass × gravity = 56652 kg × 9.8 m/s² = 555189.6 N.
Calculate the center of mass:
The center of mass for a full tank is at half the depth:
3 meters.
Calculate the work done:
Work = weight × height = 555189.6 N × 3 m = 1665568.8 J (Joules).
Part b :
Here, the height the liquid needs to be moved is 6 m (tank height) + 2 m (spout height):
6 + 2 = 8 meters.
Work = weight × height
Work = 555189.6 N × 8 m = 4441516.8 J.
Part c :
Calculate the volume of two-thirds of the tank:
Volume = (2/3) × 72 m³ = 48 m³.
Calculate the mass of two-thirds of the liquid:
Mass = 786 kg/m³ × 48 m³ = 37728 kg.
Calculate the weight of two-thirds of the liquid:
Weight = 37728 kg × 9.8 m/s² = 369734.4 N.
Since the tank is still of uniform depth, the center of mass for the remaining liquid will be halfway up the tank's current depth:
1.5 meters (half of the 3 meters left).
Work = weight × height
Work = 369734.4 N × 3 m = 1109203.2 J.
Part d :
Height the liquid needs to be moved = 6 m (tank height) + 2 m (spout height) = 8 meters.
Work = weight × height
Work = 369734.4 N × 8 m = 2957875.2 J.
A polarized Light of intensity I0 is incident on an analyzer. What should the angle between the axis of polarization of the light and the transmission axis of the analyzer be to allow 44% of the total intensity to be transmitted?
Answers
Answer:
You could use Malus's Law. Malus's Law tells us that if you have a polarized wave (of intensity I 0 0 ) passing through a polarizer the emerging intensity ( Y OR ) will be proportional to the square cosine of the angle between the polarization direction of the incoming wave and the axis of the polarizer.
Explanation:
OR: I = I 00 ⋅ cos two ( e )
What are the radius and height above the ground of a circular geosynchronous orbit around the Earth (in m and Earth radii)? Is this a high or low orbit? How does its height compare with the height of the orbit of the International Space Station (about 360 km)? [HINT: You'll need to derive an algebraic relation between orbit radius and period, instead of just radius and speed.] (b)
Answers
Answer: radius r = 42360.7km
Height above ground = 35950.7km
The height of the satellite above the ground is about 100 times the height of the ISS above the ground.
This is a high orbit.
Explanation: a synchronous satellite of mass m, revolving around earth with angular speed w, having a radius of travel r will experience centripetal force F = m*r*w^2*
But w = 2¶/T
F = m*r*(2¶/T)^2
F = (4*m*r*¶^2)/T^2
For the same body on the surface of the earth of radius R, the force F will be F =mg
According to newton's law,
(4*m*r*¶^2)/T^2 is proportional to 1/r^2
also mg is proportional to 1/R^2
Therefore,
(4*m*r*¶^2)/T^2 = K/r^2,
mg = K/R^2
Equating the two we get
K = gR^2 = (4*r^3*¶^2)/T^2 (where K is a constant equal to the product of mass of earth M and gravitational constant.)
r^3 = (g*R^2*T^2)/(4x3.142^2)
Substituting values of g=9.81m/s2
R = 6400000m (radius of earth)
T = 60x60x24 = 86400s (synchronous orbit has period equal one day)
r = 42350775.04m = 42350.7km
Height above ground H = r - R
H = 42350.7 - 6400 = 35950.7km
Please verify with calculator. Thanks
The electric potential, when measured at a point equidistant from two particles that have charges equal in magnitude but of opposite sign, isA) equal to the net electric field B) smaller than zero C) equal to zero D) equal to the averages of the two distances times the charge E) larger than zero
Answers
Answer:
C) equal to zero
Explanation:
Electric potential is calculated by multiplying constant and charge, then dividing it by distance. The location that we want to measure is equidistant from two particles, mean that the distance from both particles is the same(r2=r1). The charges of the particle have equal strength of magnitude but the opposite sign(q2=-q1). The resultant will be:V = kq/r
ΔV= V1 + V2= kq1/r1 + kq2/r2
ΔV= V1 + V2= kq1/r1 + k(-q1)/(r)1
ΔV= kq1/r1 - kq1/r1
ΔV=0
The electric potential equal to zero
The insulating solid sphere in the previous Example 24.5 has the same total charge Q and radius a as the thin shell in the example here. Consider the electric fields due to the sphere (E_sphere), the shell (E_shell), and a point charge Q (E_Q). Rank the strength of the electric fields due to these three charged objects at the same three points ('1' represents the object with the strongest, '2' for the next in strength and so on. For example, you can have the triad {3, 1, 2} as your answer, or {2, 1, 2} if the shell is strongest while the sphere and the point charge have equal strengths.): r greaterthan a a. {1, 1, 2} b. {2, 1, 1} c. {1, 1, 1} d. {2, 2, 1} e. {1, 2, 3} r lesserthan a a. {2,2, 1} b. {1,1,1} c. {2, 3, 1} d. {2,1,1} e.{1, 2, 1}
Answers
Answer and Explanation:
Using Gauss's law,
If r>a
then charge enclosed in all the three cases is same as Q.
So Electric field for all three is same.
So {1,1,1}.
(b) r<a,
Charge enclosed in case of shell is zero since all charge is present on the surface. So E = 0.
Charge enclosed by incase of point charge is Q.
Charge enclosed in case of sphere is Qr3/a3 which is less than Q.
So ranking {2,3,1}
A wire 1 mm in diameter is connected to one end of a wire of the same material 2 mm in diameter of twice the length. A voltage source is connected to the wires and a current is passed through the wires. If it takes time T for the average conduction electron to traverse the 1-mm wire, how long does it take for such an electron to traverse the 2-mm wire
Answers
Answer:
T = 2 T₀
Explanation:
To answer this question let's write the expression for electrical conductivity
σ = n e2 τ / m*
The relationship with resistivity is
ρ = 1 /σ
Whereby the resistance
R = ρ L / A = 1 /σ L / A
We see that there is no explicit relationship between time and resistance, there is only a dependence on the life time (τ) that depends on the properties of the material, not on its diameter or length.
As also the average velocity or electron velocity of electrons is constant, the time to cross 2 mm in length is twice as long as the time to cross a mm in length
T = 2 T₀
A 25-kg iron block initially at 350oC is quenched in an insulated tank that c ontains 100 kg of water at 18oC. Assuming the water that vaporizes during the process condenses back in the tank, determine the total entropy change during this process.
Answers
Answer: 4.08kg/J
Explanation: Please find the attached file for the solution
Answer:
Entropy = 4.08 kj/k
Explanation:
From energy balance in first law of thermodynamics, we have;
Δv(i)+ ΔU(h2o) = 0
Thus;
[MCp(T2 - T1)]iron + [MCp(T2 - T1)]water = 0
Where Cp is specific heat capacity
For iron, Cp = 0.45 Kj/kg°C and for water, Cp = 4.18 Kj/kg°C
From question, Mass of iron =25kg while mass of water = 100kg
And Initial temperature of iron (T1) = 350°C while initial temperature of water(T1) = 18°C
Thus,
[25 x 0.45(T2 - 350)] + [100 x 4.18(T2 - 18)] = 0
11.25T2 - 3937.5 + 418T2 - 7524 = 0
So,
429.25T2 = 11461.5
T2 = 26.7 °C
Now for entropy, we have convert the temperature from degree celsius to kelvins.
Thus, for iron T1 = 350 + 273 = 623K and for water, T1 = 18 + 273 = 291 K. Also, T2 = 26.7 + 273 = 299.7K.
The entropy changes will be;
For iron ;
Δs(i) = MCp(In(T2/T1)) = 25 x 0.45(In(299.7/623)) = -8.23 Kj/k
Now, for water;
Δs(water) = MCp(In(T2/T1)) = 100 x 4.18(In(299.7/291)) = 12.31 kj/k
Thus, total entropy will be the sum of that of iron and water.
Δs(total) = 12.31 kj/k - 8.23 Kj/k = 4.08 kj/k
For your senior project, you would like to build a cyclotron that will accelerate protons to 10% of the speed of light. The largest vacuum chamber you can find is 60 cm in diameter.
Answers
The given question is incomplete. The complete question is as follows.
For your senior project, you would like to build a cyclotron that will accelerate protons to 10% of the speed of light. The largest vacuum chamber you can find is 60 cm in diameter.
What magnetic field strength will you need?
Explanation:
Formula for the strength of magnetic field is as follows.
B = [tex]\frac{mv}{qr}[/tex]
Here, m = mass of proton = [tex]1.67 \times 10^{-27}[/tex] kg
v = velocity = 10% of [tex]3 \times 10^{8}[/tex] = [tex]3 \times 10^{7}[/tex] m/s
q = charge of proton = [tex]1.6 \times 10^{-19} C[/tex]
r = radius = [tex]\frac{60}{2}[/tex] = 30 cm = 0.30 m (as 1 m = 100 cm)
Therefore, magnetic field will be calculated as follows.
B = [tex]\frac{mv}{qr}[/tex]
= [tex]\frac{1.67 \times 10^{-27} \times 3 \times 10^{7}}{1.6 \times 10^{-19} C \times 0.30 m}[/tex]
= [tex]\frac{5.01 \times 10^{-20}}{0.48 \times 10^{-19}}[/tex]
= 1.0437 T
Thus, we can conclude that magnetic field strength is 1.0437 T.
The student queries about the construction of a cyclotron to accelerate protons to a specific velocity. The radius and rotational period of protons within the cyclotron are calculated using the magnetic field strength and the desired velocity.
Explanation:The student is interested in building a cyclotron that can accelerate protons to 10% of the speed of light, with specific constraints on the vacuum chamber dimensions. In physics, particularly in the field of particle accelerators, a cyclotron is a type of particle accelerator that uses a combination of an electric field and a constant magnetic field to increase the kinetic energy of charged particles. The radius of the cyclotron, which determines the maximum orbit size for the particles being accelerated, is a critical design parameter and can be calculated based on the desired kinetic energy of the particles and the strength of the magnetic field.
In the context of a cyclotron, the student might need to calculate the rotational period and maximum radius of proton orbits within given specifications such as the strength of the magnetic field and desired velocity. Understanding the principles behind cyclotrons and particle acceleration is essential for this project, which falls under the umbrella of advanced physics topics.
Consider a high pressure system with a value of 1045mb and a low pressure system with a value of 997mb. The two pressure systems are 250 km apart. The pressure gra the two pressure systems is: A. 48mb/250km (0.19mb/km) B. 250mb/48km (5.21mb/km) C. 16mb/40km (0.4mb/km) D. Imb/25km (0.04mb/km).
Answers
Answer:
GRadient= 0.192 mb / km , the correct answer is a
Explanation:
The pressure gradient would be considered linear so we can use a proportional rule to find the gradient
Gradient = Dp / Dd
Gradient = (1045 -997) / 250
Gradient = 48/250
GRadient= 0.192 mb / km
The correct answer is a
Calculate the range of wavelengths for the frequencies found on the FM band. Take a look at the "whip" radio antennas on cars, comment on the size of the wavelength and the antenna. {2.8 – 3.4 m}
Answers
Answer:
2.8m-3.4m
Explanation:
Radio waves are electromagnetic waves and they all travel with a speed of
[tex]3*10^8m/s[/tex] in air.
The range of frequencies in the FM band is from 88MHz to 108MHz.
Generally, the relationship between velocity, frequency and wavelength for electromagnetic waves is given by equation (1);
[tex]v=\lambda f..............(1)[/tex]
From equation (1), we can write,
[tex]\lambda=\frac{v}{f}...............(2)[/tex]
For the upper frequency of 108MHz, the wavelength is given by;
[tex]\lambda_1=\frac{3*10^8}{108*10^6}\\\lambda_1=0.02778*10^2\\\lambda_1=2.78m[/tex]
Similarly, for the lower frequency of 88MHz, the wavelength is given by;
[tex]\lambda_2=\frac{3*10^8}{88*10^6}\\\lambda_2=0.0341*10^2\\\lambda_2=3.41m[/tex]
The range of wavelength therefore is [tex]\lambda_1-\lambda_2=2.8m-3.4m[/tex] approximately.
Please note the following:
[tex]108MHz=108*10^6Hz\\88MHz=88*10^6Hz[/tex]
Fluid originally flows through atube at a rate of 200 cm3/s. Toillustrate the sensitivity of the Poiseuille flow rate to variousfactors, calculate the new flowrate for the following changes with all other factors remaining the same as in the original conditions: A new fluid with 6.00 times greater viscosity is substituted. Poiseuille flow is given by:
Answers
Answer:
[tex]Q_{2}=1200cm^{3}/s[/tex]
Explanation:
Given data
Q₁=200cm³/s
We know that:
[tex]F=n\frac{vA}{l}\\[/tex]
can be written as:
ΔP=F/A=n×v/L
And
Q=ΔP/R
As
n₂=6.0n₁
So
Q=ΔP/R
[tex]Q=\frac{nv}{lR}\\ \frac{Q_{2}}{n_{2}}= \frac{Q_{1}}{n_{1}}\\ Q_{2}=\frac{Q_{1}}{n_{1}}*(n_{2})\\Q_{2}=\frac{200}{n_{1}}*6.0n_{1}\\ Q_{2}=1200cm^{3}/s[/tex]
A proton moves through a magnetic field at 26.7 % 26.7% of the speed of light. At a location where the field has a magnitude of 0.00687 T 0.00687 T and the proton's velocity makes an angle of 101 ∘ 101∘ with the field, what is the magnitude of the magnetic force acting on the proton?
Answers
Answer:
[tex]8.64283\times 10^{-14}\ N[/tex]
Explanation:
q = Charge of proton = [tex]1.6\times 10^{-19}\ C[/tex]
v = Velocity of proton = [tex]0.267\times c[/tex]
c = Speed of light = [tex]3\times 10^8\ m/s[/tex]
B = Magnetic field = 0.00687 T
[tex]\theta[/tex] = Angle = [tex]101^{\circ}[/tex]
Magnetic force is given by
[tex]F=qvBsin\theta\\\Rightarrow F=1.6\times 10^{-19}\times (0.267\times 3\times 10^8)\times 0.00687\times sin101\\\Rightarrow F=8.64283\times 10^{-14}\ N[/tex]
The magnetic force acting on the proton is [tex]8.64283\times 10^{-14}\ N[/tex]
The slope of a line on a distance-time graph represents _____. distance time displacement speed
Answers
Answer:
speed
Explanation:
The slope of a line on any distance-time graph represents the speed of the object.
Velocity only comes in when there is speed of the object in a particular direction.
A small toy car draws a 0.50-mA current from a 3.0-V NiCd battery. In 10 min of operation, (a) how much charge flows through the toy car, and (b) how much energy is lost by the battery? 4. (Resistance and Ohm’s law, Prob. 17.16, 1.0 point) How
Answers
Answer:
(a) 0.3 C
(b) 0.9 J
Explanation:
(a)
Given:
Current drawn (I) = 0.50 mA = 0.50 × 10⁻³ A
Terminal voltage (V) = 3.0 V
Time of operation (t) = 10 min = 10 × 60 = 600 s
Charge flowing through the toy car 'Q' is given as:
[tex]Q=It[/tex]
Plug in the given values and solve for 'Q'. This gives,
[tex]Q=(0.50\times 10^{-3}\ A)(600\ s)\\\\Q=0.3\ C[/tex]
Therefore, 0.3 C charge flows the toy car.
(b)
Energy lost by the battery is equal to the product of power consumed by the battery and time of operation.
Power consumed by the battery is given as:
[tex]P=VI[/tex]
Plug in the given values and solve for 'P'. This gives,
[tex]P=(3.0\ V)(0.50\times 10^{-3}\ A)\\\\P=1.5\times 10^{-3}\ W[/tex]
Therefore, the energy lost by the battery is given as:
[tex]E=P\times t\\\\E=1.5\times 10^{-3}\ W\times 600\ s\\\\E=0.9\ J[/tex]
Therefore, the energy lost by the battery is 0.9 J
A 1200 kg car reaches the top of a 100 m high hill at A with a speed vA. What is the value of vA that will allow the car to coast in neutral so as to just reach the top of the 150 m high hill at B with vB = 0? Neglect friction.
Answers
Answer:
the value of vA that will allow the car to coast in neutral so as to just reach the top of the 150 m high hill at B with vB = 0 is 31.3 m/s
Explanation:
given information
car's mass, m = 1200 kg
[tex]h_{A}[/tex] = 100 m
[tex]v_{A}[/tex] = [tex]v_{A}[/tex]
[tex]h_{B}[/tex] = 150 m
[tex]v_{B}[/tex] = 0
according to conservative energy
the distance from point A to B, h = 150 m - 100 m = 50 m
the initial speed [tex]v_{A}[/tex]
final speed [tex]v_{B}[/tex] = 0
thus,
[tex]v_{B}[/tex]² = [tex]v_{A}[/tex]² - 2 g h
0 = [tex]v_{A}[/tex]² - 2 g h
[tex]v_{A}[/tex]² = 2 g h
[tex]v_{A}[/tex] = √2 g h
= √2 (9.8) (50)
= 31.3 m/s
What is the magnifying power of an astronomical telescope using a reflecting mirror whose radius of curvature is 5.5 mm and an eyepiece whose focal length is 2.9 cmcm ? Follow the sign conventions.
Answers
The magnifying power of an astronomical telescope will be:
"0.095".
Telescope: Focal length and PowerAccording to the question,
Radius of curvature, R = 5.5 mm
Focal length of eyepiece, [tex]F_e[/tex] = 2.9 cm
We know that,
→ Focal length of mirror,
F₀ = [tex]\frac{Radius \ of \ curvature}{2}[/tex]
By substituting the values,
= [tex]\frac{5.5}{2}[/tex]
= 2.75 mm or,
= 0.278 cm
hence,
The telescope's magnification be:
= [tex]\frac{F_0}{F_e}[/tex]
= [tex]\frac{0.275}{2.9}[/tex]
= 0.095
Thus the above approach is correct.
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Final answer:
The magnifying power of the astronomical telescope using the given values is approximately 0.19.
Explanation:
In order to find the magnifying power of an astronomical telescope, we need to use the formula:
Magnifying Power = Angular Magnification = (focal length of objective) / (focal length of eyepiece)
Given that the radius of curvature of the reflecting mirror is 5.5 mm (which is equal to 0.55 cm) and the focal length of the eyepiece is 2.9 cm, we can substitute these values into the formula to find the magnifying power.
Magnifying Power = (radius of curvature of mirror) / (focal length of eyepiece)
Magnifying Power = 0.55 cm / 2.9 cm
Magnifying Power = 0.19
Therefore, the magnifying power of the astronomical telescope is approximately 0.19.
A 0.453 kg pendulum bob passes through the lowest part of its path at a speed of 2.58 m/s. What is the tension in the pendulum cable at this point if the pendulum is 75.1 cm long? Submit Answer Tries 0/12 When the pendulum reaches its highest point, what angle does the cable make with the vertical? Submit Answer Tries 0/12 What is the tension in the pendulum cable when the pendulum reaches its highest point?
Answers
Answer with Explanation:
Mass of pendulum bob, m=0.453 kg
Speed, [tex]v_1=[/tex]2.58 m/s
a.r=75.1 cm=[tex]75.1\times 10^{-2}m[/tex]=0.751 m
[tex] 1cm=10^{-2} m[/tex]
Tension in the pendulum cable is given by
Tension=Centripetal force+force due to gravity
[tex]T=\frac{mv^2}{r}+mg[/tex]
Where [tex]g=9.8 m/s^2[/tex]
Substitute the values
[tex]T=\frac{0.453(2.58)^2}{75.1\times 10^{-2}}+0.453\times 9.8[/tex]
[tex]T=8.45 N[/tex]
b.When the pendulum reaches its highest point,then
Final velocity, [tex]v_2=0[/tex]
According to law of conservation of energy
[tex]mgh_1+\frac{1}{2}mv^2_1=mgh_2+\frac{1}{2}mv^2_2[/tex]
[tex]gh_1+\frac{1}{2}v^2_1=gh_2+\frac{1}{2}v^2_2[/tex]
[tex]h_1=0[/tex]
Substitute the values
[tex]9.8\times 0+\frac{1}{2}(2.58)^2=9.8\times h_2+\frac{1}{2}(0)^2[/tex]
[tex]3.3282=9.8h_2[/tex]
[tex]h_2=\frac{3.3282}{9.8}=0.34 m[/tex]
The angle mad by cable with the vertical=[tex]cos\theta=\frac{0.751-0.34}{0.751}=0.55[/tex]
[tex]\theta=cos^{-1}(0.55)=56.6^{\circ}[/tex]
c.When the pendulum reaches at highest point then
Acceleration, a=0
Therefore, the tension in the pendulum cable
[tex]T=mgcos\theta[/tex]
Substitute the values
[tex]T=0.453\times 9.8cos56.6[/tex]
[tex]T=2.4 N[/tex]
Clearly, Atwood’s machine has a lot of systematic error that would not be present if we were to simplify the experiment. What is one reason we might expect to get better results using Atwood’s machine rather than following Galileo’s example and just dropping objects off of tall buildings?
Answers
Answer:
Better Equilibrium Maintenance for better accuracy...
Explanation:
In the Galileo's experiment, there is no utilization of two equal masses at a time. However, as we can see in a Atwood Machine, there are two equal masses involved that make the whole system to be in a state of equilibrium and ultimately the better measurements of acceleration due to gravity.
The 500-kg cylindrical drum is supported by a metal cable (A-B) and a rigid plate (B-C). If the contact between the drum and all surfaces is frictionless and its radius is 500 mm, compute the elongation of the cable (A-B). The elastic modulus of A-B is 200 GPa. A, B, and C are pinned joints. Note that the cross section of Cable A-B is 5 mm2 .
Answers
Explanation:
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A ball of mass I .5 kg falls vertically downward. Just before striking the floor, its speed is 14 m/s. Just after rebounding upward, its speed is 10 m/s.
If this change of velocity took place in 0.20 seconds, what is the average force of the ball on the floor?
Answers
Answer:
180 N
Explanation:
We know that acceleration is the rate of change of speed per unit time hence
[tex]a=\frac {v_f-v_i}{t}[/tex] where v and t are velocity and time respectively, f and i represent final and initial.
Also, from Newton's law of motion, F=ma and replacing a with the above then
[tex]F=m\frac {v_f-v_i}{t}[/tex]
Substituting 1.5 Kg for mass, m -14 m/s for i and 10 m/s for for v then
[tex]F=1.5\times \frac {10--14}{0.2}=180 N[/tex]
Therefore, the force is 180 N
The average force exerted by a 1.5 kg ball on the floor, falling with a speed of 14 m/s and rebounding with a speed of 10 m/s over 0.20 seconds, is 180 N.
Explanation:The subject of this question is Physics and from the concept of impulse and momentum. The change in momentum equals the product of force and the time over which the force is applied. So, we can calculate the force using this formula: Force = Change in momentum / Time.
In this case, the ball's momentum changes by the difference in velocity multiplied by the mass of the ball, which is (14 m/s + 10 m/s) * 1.5 kg. The reason the velocities are added is because the direction of velocity changes, making the speed of ball before and after striking the floor of equal magnitude but opposite in direction. So, the change in momentum becomes 36 kg*m/s. Given that the time is 0.20 seconds, the force would be 36 kg*m/s divided by 0.20 s, or 180 N.
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1.!(1)!A!hiker!determines!the!length!of!a!lake!by!listening for!the!echo!of!her!shout!reflected!by!a! cliff!at!the!far!end of!the!lake.!She!hears!the!echo!2.0!s!after!shouting.!Estimate the!length!of!the! lake.
Answers
Answer:
The length of the lake is 340 meters.
Explanation:
It is given that, a hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2 s after shouting. We need to find the length of the lake.
The distance covered by the person in 2 s is :
[tex]d=vt[/tex]
v is the speed of sound
[tex]d=340\ m/s\times 2\ s[/tex]
[tex]d=680\ m[/tex]
The length of the lake is given by :
[tex]l=\dfrac{d}{2}[/tex]
[tex]l=\dfrac{680\ m}{2}[/tex]
l = 340 meters
So, the length of the lake is 340 meters. Hence, this is the required solution.
Using the first definition of coefficient of elasticity given in the lab (based on velocity), if a ball strikes a surface with a speed of 10 m/s and rebounds just after the collsion with a speed of 3 m/s, what is the coefficient of elasticity
Answers
Final answer:
The coefficient of elasticity is a measure of the elasticity of a collision, defined as the ratio of speeds after and before the collision. In this case, the coefficient of elasticity is 0.3.
Explanation:
The coefficient of elasticity, also known as the coefficient of restitution (c), is a measure of the elasticity of a collision between a ball and an object. It is defined as the ratio of the speeds after and before the collision.
In this case, the ball strikes a surface with a speed of 10 m/s and rebounds with a speed of 3 m/s. To find the coefficient of elasticity, we can use the formula c = (v_final / v_initial), where v_final is the final velocity and v_initial is the initial velocity.
Therefore, the coefficient of elasticity in this case would be c = (3 m/s / 10 m/s) = 0.3.
A piston raises a weight, then lowers it again to its original height. If the process the system follows as the piston rises is isothermal, and as it falls is isobaric, then is the work done by the gas positive, negative, or zero? Explain
Answers
Answer:
Negative
Explanation:
First law of thermodynamic also known as the law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.
The first law relates relates changes in internal energy to heat added to a system and the work done by a system by the conservation of energy.
The first law is mathematically given as ΔU = [tex]U_{F}[/tex] - [tex]U_{0}[/tex] = Q - W
Where Q = Quantity of heat
W = Work done
From the first law The internal energy has the symbol U. Q is positive if heat is added to the system, and negative if heat is removed; W is positive if work is done by the system, and negative if work is done on the system.
Analyzing the pistol when it raises in isothermal and when it falls in isobaric state.The following can be said:
In the Isothermal compression of a gas there is work done on the system to decrease the volume and increase the pressure. For work to be done on the system it is a negative work done then.
In the Isobaric State An isobaric process occurs at constant pressure. Since the pressure is constant, the force exerted is constant and the work done is given as PΔV.If a gas is to expand at a constant pressure, heat should be transferred into the system at a certain rate.Isobaric is a fuction of heat which is Isothermal Provided the pressure is kept constant.
In Isobaric definition above it can be seen that " Heat should be transferred into the system ata certain rate. For heat to be transferred into the system work is deinitely been done on the system thereby favouring the negative work done.