HELP!!!

Which of the following is an example of a wedge? A. a fixed pulley B. a spiral stair case C. an ax D. a see-saw

Answer:

Explanation:

They substituted the value of M₁.

∑F = ma

M₁ a = T₁ - F

M₁ a = T₁ - Nμ

M₁ a = T₁ - M₁g μ

Given that M₁ = 2, g = 9.81, and μ = 0.25:

(2) a = T₁ - (2) (9.81) (0.25)

Answer:

(A) burning wood

Explanation:

Burning of wood is the only combustion reaction we have listed among the options.

Combustion is an exothermic reaction in that heat is released to the environment. Combustion usually occurs in the presence of oxygen. In this reaction, a fuel source, the wood reacts with oxygen to produce heat energy and some other products.

Answer:

A. Burning wood

Explanation:

Answer:

1.45 K

I had the same question and i got it right.

Answer:

T = 1.45 K

Explanation:

As per Wein's law we know that

[tex]\lambda = \frac{2.9 \times 10^6 nm K}{T}[/tex]

here we know that

[tex]\lambda[/tex] = wavelength of peak intensity

[tex]T [/tex] = temperature of the object

so as per above formula we know that

[tex]\lambda = 2 \times 10^6 nm[/tex]

so we have

[tex]2 \times 10^6 = \frac{2.9 \times 10^6 nm K}{T}[/tex]

[tex]T = 1.45 K[/tex]

Its speed is zero at the beginning of the 3.25 s and 14 m/s at the end.

I'm thinking you probably wanted to find the car's acceleration.

Acceleration = (change in speed) / (time for the change)

Acceleration = (14 m/s) / (3.25 s)

Acceleration = 4.31 m/s²

The car's speed is 14.0 m/s; it had accelerated from 0 m/s over the course of 3.25 seconds.

The car, as described in your question, started at a speed of 0 m/s and in 3.25 s, it reached a speed of 14.0 m/s. This means the car's final speed or velocity is 14.0 m/s.

Let's add some context to help you understand. Acceleration is the pace at which an object changes its speed and is measured in m/s². In your case, the car starts from rest (0 m/s) and after 3.25 s, it attains a speed of 14.0 m/s. This implies that the car has been accelerating. Finally, it attains the speed of 14.0 m/s.

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General Characteristics of Acids & Bases. Chemists measure the strength of an acid or base by its pH, which is a term that refers to the "power of hydrogen.". The midpoint of the pH scale is neutral. Compounds with a pH lower than the midpoint value are acidic while those with a higher value are basic or alkaline.

Answer:

B) 2.2 Ω

Explanation:

The resistor between B and C is connected in parallel to the resistor between C and D (because their ends are connected to the same points: C on one side and B (which has same voltage as D) on the other side, so they have same potential difference across them.

So their equivalent resistance is

[tex]\frac{1}{R_{BD}}=\frac{1}{R_{BC}}+\frac{1}{R_{CD}}=\frac{1}{4.0 \Omega}+\frac{1}{5.0 \Omega}=\frac{9}{20 \Omega}\\R_{BD}=\frac{20 \Omega}{9}=2.22 \Omega[/tex]

The resistor between A and B, instead, is short-circuited, because the current flows through the upper branch of the circuit (connecting A with C), which has zero resistance (it is a wire without any resistor). This means that the resistor between A and B should not be considered: so, the total resistance of the circuit is

[tex]2.2 \Omega[/tex]

Answer:

F = MLT^-2

Explanation:

Dimension of force

Force = Mass × acceleration

= Mass × (displacement/time²)

= M¹ × (L¹/T²)

= M¹ × L¹T-²

Force = MLT^-2

Thus, The dimension of Force is MLT^-2

Explanation:

the Dimension of force is MLT^-2

Answer:

2.21

Explanation:

At STP, 1 mol of gas has a volume of 22.4 L, so we know we're starting with 1 mol of gas.

Assuming the temperature and volume are held constant, the number of moles needed to reach 325 kPa is found with ideal gas law:

PV = nRT

(325,000 Pa) (0.0224 m³) = n (8.314 Pa m³ / mol / K) (273.15 K)

n = 3.21 mol

Since we started with 1 mol, we need to add 2.21 mol.

According to the Avogadro's law, 2.2075 mole are needed to be added to the container to make the pressure equal to 325 kPa.

Avogadro's law is a gas law which states that the total number of atoms or molecules has a direct proportion to the volume occupied by a gas at a constant temperature and pressure.

It is closely related to ideal gas equation as it links temperature, pressure, volume and the amount of substance.It is given as, V∝n,

The straight line graph of volume versus moles is a straight line passing through the origin which implies that zero moles of gas occupy zero volume.

As 1atm=101.325 kPa so, 325 kPa=325/101.325=3.2075 atm,as at STP 1 atm=22.4 liter.

Applying Avogadro's law, n₂=71.848×1/22.4=3.2075 moles .In order to find moles to be added , 3.2075-1= 2.2075 moles.

Thus, 2.2075 moles of gas are to be added to the container to make the pressure equal to 325 kPa.

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Answer:

27 m/s

Explanation:

Momentum is conserved.

Initial momentum = final momentum

(0.25 kg) v = (45 kg + 0.25 kg) (0.15 m/s)

v ≈ 27 m/s

Answer:

2 2/3 m/s²

Explanation:

Acceleration is a measure of change in speed over time. What it means mathematically is the difference between your ending and starting speed divided by the total time between.

Here, our starting speed is 5 m/s and our ending speed is 13 m/s, so our change in speed is 13 m/s - 5 m/s = 8 m/s, and our total time between is 3 s, so that gives us an acceleration of (8 m/s) / (3 s), which is 8/3 m/s², or 2 2/3 m/s²

(A little note: m/s² is just an abbreviation for m/s/s, or "meters per second per second," and you read it as "meters per second squared")

Answer:

15 m/s

Explanation:

Initial momentum = final momentum

(25 kg) (15 m/s) + (25 kg) (0 m/s) = (25 kg) (0 m/s) + (25 kg) v

v = 15 m/s

Answer:

Hey there!! So the answer is that the heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change of temperature. Hope this helped and have a great day!!

Answer:

Explanation:

This is the invisible heat required to change the state of a body either from solid to liquid or from liquid to gas.

Latent heat is not detectable by a thermometer.

There are two types of latent heat

(1) Latent heat of fusion

(2) Latent heat of vaporization

(1) Latent heat of fusion: This is the heat energy required to convert a substance from its solid form to its liquid form without a change in temperature.

(2) Latent heat of vaporization: This is the heat required to convert a substance from its liquid form to vapour without a change in temperature.

Answer:

B. The core is the thickest of Earths layers

Explanation:

Option A  is incorrect because the crust is way thinner than the mantel.

Option C is incorrect because the inner core is 1k whereas the outercore is 2k

Option D is incorrect because the crust is the thinnest layer

The core is the thickest of earths layers,is the conclusion is supported by information in the table.

The core is the thickest of earths layers,is the conclusion is supported by information in the table.

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Answer:

d

Explanation:

i got it correct on my test

Answer:

0.24 kg used up

Explanation:

He has a mass of 67 kg

The gravitational constant is 9.81 m/s^2

The distance upward is 3500 m

W = m*g*h

W = 67 * 9.81 * 3500

Work = 2,300,445 Joules

Work = 2300 kj

work = 2.30 * 10^6 joules in scientific notation.

Part B

He needs 4 times this amount to climb the mountain because the body is only 25% efficient in converting energy.

4*2.30 * 10^6 = 9.20 * 10^6 Joules of energy are therefore required.

The total amount in a kg of fat = 3.8 * 10^7 joules

x kg of fat is needed to provide 9.20.*10^6 joules

1 kg / (3.8 * 10^7 J ) = x kg / (9.20 * 10^6 J)

9.20 * 10 ^6 * 1 = 3.8 * 10^7 *x

9.20 * 10 ^6 / 3.8 * 10^7 = x

x = 0.24 kg of fat are needed

Answer:

A plane mirror forms a virtual, erect, same size and laterally inverted image. Virtual means that the image is not real and cannot be obtained on screen. It means the rays appear to meet behind the mirror but when you will actually go behind, you will find nothing. A virtual image is always erect.

A real image is always inverted. It can be obtained on the screen. Rays actually meet at a point.

A virtual image in a plane mirror appears to be behind the mirror because the light rays do not actually converge there. You can see and photograph a virtual image, but it cannot be projected onto a screen.

The word “virtual” refers to something that exists in effect but not in actual fact. In the context of a plane mirror, a virtual image is one where the light rays appear to diverge from a point behind the mirror, but they do not actually meet there. When you look at yourself in a plane mirror, the image you see is indeed a virtual image because it appears to be behind the mirror where light does not truly exist. The rays of light reflecting off your face diverge and appear to the observer as if they are coming from a point behind the mirror.

Answer:

54 N

Explanation:

Draw a free body diagram.  There are four forces acting on the balloon.  Buoyant force pushing the balloon up, gravity pulling the helium down, gravity pulling the balloon skin down, and gravity pulling the load down.

Apply Newton's second law:

∑F = ma

B − Wh − Wb − L = ma

When the load is at a maximum, the acceleration is 0:

B − Wh − Wb − L = 0

B − Wh − Wb = L

B − mh g − Wb = L

The mass of the helium is its density times its volume:

B − ρh Vh g − Wb = L

Buoyant force is defined as B = ρVg, where ρ is the density of the displaced fluid (in this case, air), V is the volume of the displaced fluid, and g is acceleration of gravity.  Since the volume of displaced air = the volume of the helium:

ρa V g − ρh V g − Wb = L

(ρa − ρh) V g − Wb = L

Given that ρa = 0.90 kg/m³, ρh = 0.178 kg/m³, V = 20 m³, g = 9.8 m/s², and Wb = 88 N:

(0.9 − 0.178) (20) (9.8) − (88) = L

L = 53.5 N

Rounded to 2 sig-figs, the maximum load that can be supported is 54 N.

Answer:

A and D

Explanation:

A and D, since fuses + circuit breakers are made to prevent any further damage from an excessive amount of current. So, them breaking/tripping means that there are too many appliances on a parallel circuit, since adding resistors creates more current.

Options A and D are correct.When too many appliances are drawing from the same parallel circuit, the circuit may overheat blown fuse and a circuit breaker tripped occurred.

A blown fuse may be discolored, hazy, or include melted or fractured metal. Remove the blown fuse while the main power is still turned off.

If your circuit breaker continues tripping, there's probably a problem with the circuit. A short circuit in one of the appliances or in the wiring might be the cause.

It's possible that the breaker is tripping due to a ground fault. A circuit overload is possible.

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Answer: Option d

Explanation:

According to Newton's third law, for every force "P" that is applied on an object there is a force -P that has the same maginitud that "P" and opposite direction.

In other words "for every action there is an  equal and opposite reaction"

For example, if Object D applies a force "P" on an object B, then object B will make a force -P on object D.

This force is called the reaction force.

Therefore when the swimmer pushes the wall, then the wall pushes the swimmer with a force of the same magnitude that is called the reaction force.

Answer:

Explanation:

A swimmer uses her feet to push off the wall and the wall exerts the same force back on her. The force exerted by the wall on the swimmer is called ____________.

A. action force

B. friction

C. gravity

D. reaction force

Answer:

3.1 m/s

Explanation:

The acceleration of the ball is given by:

[tex]a=\frac{v-u}{t}[/tex]

where

v is the final velocity

u is the initial velocity

t is the time elapsed

Here we know:

a = 1.8 m/s^2 is the acceleration

v = 7.6 m/s is the final velocity

t = 2.5 is the time elapsed

Solving for u, we find the initial velocity of the ball:

[tex]u=v-at=7.6 m/s-(1.8 m/s^2)(2.5 s)=3.1 m/s[/tex]

Answer:

81.8 m/s

Explanation:

The initial velocity of the plane is:

[tex]v_0=115 m/s[/tex] (toward east)

So, decomposing along the x- and y- directions:

[tex]v_{x0} = 115 m/s\\v_{y0} = 0[/tex]

(we took east as positive x-direction and north as positive y-direction)

The acceleration is

[tex]a=2.88 m/s^2[/tex] (northwest, so the angle with the positive x-direction is 135 degrees)

Decomposing it along the two directions:

[tex]a_x = a cos 135^{\circ} = (2.88 m/s^2)(cos 135^{\circ})=-2.04 m/s^2\\a_y = a sin 135^{\circ} = (2.88 m/s^2)(sin 135^{\circ})=2.04 m/s^2[/tex]

So the two components of the velocity after a time t = 25.0 s will be

[tex]v_x = v_{x0} + a_x t = 115 m/s + (-2.04 m/s^2)(25.0 s)=64 m/s\\v_y = v_{y0} + a_y t = 0 m/s + (2.04 m/s^2)(25.0 s)=51 m/s[/tex]

So, the magnitude of the velocity of the plane will be

[tex]v=\sqrt[v_x^2+v_y^2}=\sqrt{(64 m/s)^2+(51 m/s)^2}=81.8 m/s[/tex]

Answer:

A constant magnetic field creates an electric field.

Explanation:

Well, by definition, a magnetic field produces forces on moving charges. So if there’s just a magnetic field, and there’s a conductor with no charges already moving, there’s no reason for them to start to move, and plenty of reason (Ohm’s law) for them to stop.

Mind you, if you drag the conductor sideways through the field, the magnetic field will push the charges sideways to sideways, i.e., along the wire, giving an EMF and, if there’s a closed circuit, a current. This is probably the most common way of doing things.

Answer:

A moving magnetic field creates an electric field.

A moving electric field creates a magnetic field

Explanation:

Magnetic Field is the concentration of magnetism that is created around a magnetic charge in a given space. It is the magnet that creates the magnetic field, just as it is the electric charge and the mass that, respectively, create the electric and gravitational fields.

The origin of the magnetic field is in the movement of electrical charges. When the electric field oscillates in some region of space, this oscillation gives rise to a magnetic field oriented in a direction perpendicular (90º) to the electric field. To better understand the properties of the magnetic field, we make use of a feature known as induction lines, through which we can better visualize the shape of the magnetic field.

Answer:

1) 2726.5 J/K      2) decrease                     3) 0

Explanation:

1)

change in entropy is given by [tex]\Delta s\:=\frac{Q}{T}[/tex]

here Q=mL where L is the latent heat of vaporization. therefore

[tex]Q=\frac{mL}{T}[/tex][tex]\Delta s\:=\frac{0.45X22.5X10^5}{100+273}=2726.5\:\:\frac{J}{K}[/tex]

2) [tex]\Delta S=\frac{-Q}{T}\:[/tex]

since the heat is taken from surroundings, the change in entropy is negative therefore entropy of surrounding will decrease.

3) since there is no heat exchange with universe  therefore , Q=0 in this case

[tex]\Delta S=\frac{Q}{T}\:=\frac{0}{T}=0[/tex]

To determine the entropy change of 0.45 kg of water turned into steam at 100°C, the specific heat of water, the heat of vaporization, and the temperature of the surroundings must be considered. Entropy changes of the water, surroundings, and the universe (which is zero in a reversible process) are calculated using thermodynamic equations involving heat transfer and temperature.

When 0.45 kg of water is changed by a reversible process to steam at 100°C, the calculation of entropy change involves considering the energy transfer and the temperature at which the process occurs. As this is a schoolwork question providing specific numerical answers would require more details about the temperatures of the surroundings and the specifics of the reversible process (e.g., at constant pressure or volume). However, we can discuss the general concepts applied to calculate these entropy changes:

To calculate these values in practice, you would apply the thermodynamic equation for entropy (ΔS = Q/T), where ΔS is the change in entropy, Q is the heat transfer, and T is the temperature in Kelvin.

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Answer:

the main ingredient that helps a cake rise is baking powder (sodium bicarbonate); when it interacts with the heat, it creates a chemical reaction that produces carbon dioxide (tiny bubbles) to allow the cake to be light and fluffy.

This is a type of chemical reaction...exothermic (reaction that produces heat) and endothermic (reaction of taking the heat in).  Endothermic chemical reaction that changes the batter from the thick liquid state to a firm, fluffy state.

Explanation:

Jenny's poor performance in her speech due to nervousness and stuttering is an example of performance anxiety.

This situation can be described as a case of performance anxiety, where Jenny's nerves and fear of speaking in front of the class caused her to stutter and perform poorly in her speech.

Performance anxiety is a psychological phenomenon that affects individuals in various situations, including public speaking. It can lead to physical symptoms like stuttering and psychological distress that impairs performance.

To overcome performance anxiety, Jenny can practice her speech beforehand, use relaxation techniques, and seek support from teachers or a speech therapist.

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Jenny's situation of being nervous while giving a speech and performing poorly due to stuttering is an example of performance anxiety. This type of anxiety typically occurs when a person is performing in front of others and can result in physical reactions like stuttering. Methods of mitigating this anxiety include breathing exercises and practice.

This situation is an example of performance anxiety, which falls under the Psychology subject. Performance anxiety, or stage fright, often happens when individuals are required to perform in some way in front of others. This might include giving a speech, taking an exam, or playing a sport. When a person, like Jenny, becomes too anxious or nervous, they may have physical reactions like stuttering, sweating, or even forgetting their lines, all symptoms reflected in Jenny's situation.

Jenny's fear likely stems from her perception of the situation, including her expectations of herself and her fear of other people's perceptions. This could create a situation where she performs below her actual ability level. This type of anxiety, while common, can be mitigated with various techniques such as deep breathing exercises, visualization, and practice.

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Answer:

False

Explanation:

No they do not breathe through there skin. They breathe like any other animal or mammal for thet fact. Reptiles are not mammals. There's a reason why those two words are different.

The answer is a. true

Explanation:

The force of gravity that acts on a body is called weight [tex]W[/tex] and is defined as:

[tex]W=m.g[/tex]  (1)

Where:

[tex]m=100kg[/tex] is the mass of the box

[tex]g=9.8m/s^{2}[/tex] is the gravity at sea level

Substituting these values in (1):

[tex]W=(100kg)(9.8m/s^{2})[/tex]

[tex]W=980N[/tex]

Answer:

d

Explanation:

980

Answer:

Changing "Mass" to "Amount of electric charge"

"The correct change to correct the error in Badri's table is changing ""Mass"" to ""Amount of electric charge.""

To understand why this change is necessary, let's review the factors that affect the electric force between objects according to Coulomb's Law:

Coulomb's Law states that the electric force (F) between two point charges is directly proportional to the product of the magnitudes of the charges [tex](q_1 ~and~ q_2)[/tex], and inversely proportional to the square of the distance (r) between their centers. Mathematically, this is expressed as:

[tex]\[ F = k \frac{|q_1 q_2|}{r^2} \][/tex]

where k is Coulomb's constant[tex](\( 8.9875 \times 10^9 \) Nm^2/C^2).[/tex]

From Coulomb's Law, we can see that the electric force is affected by:

1. The amount of electric charge on each object [tex](q_1 ~and~ q_2)[/tex],: The force is directly proportional to the product of the charges, meaning that if the charge on either object increases, the force increases, and vice versa.

2. The distance between the charges (r): The force is inversely proportional to the square of the distance between the charges, meaning that as the distance increases, the force decreases, and as the distance decreases, the force increases.

Mass is not a factor in Coulomb's Law for electric force; it is a factor in Newton's Law of Universal Gravitation, which describes the gravitational force between two masses. Therefore, the table should reflect that the amount of electric charge has a direct relationship with the electric force, not mass.

The corrected table should look like this:

| Factor | Relationship to Electric Force |

|---------------|---------------------------------|

| Distance | Inverse |

| Amount of electric charge | Direct |

This correction aligns with the principles of Coulomb's Law and accurately reflects the factors that influence the electric force between objects."

To make the maximum stress the same across the entire section, the proportion needs to be X squared.

The answer is X^2

The distance traveled and the time it takes to travel are both going up at a steady rate. The distance goes from lap 1, lap 2, lap 3, lap 4. The time is increasing by a minute each time. When both the x and y scenario are increasing at a STEADY RATE the line will be linear. B displays a linear line.