PHYSICS HIGH SCHOOL

What is the purpose of a voltage source?A. It removes insulators in a circuit so electrical charges flow freely.

B. It increases the potential energy of electrical charges to produce a current.

C. It increases the kinetic energy of electrical charges to produce a static discharge.

D. It transfers electrons through induction so they generate electrical energy.

Answers

Answer 1

Answer:

Answer:

B. It increases the potential energy of electrical charges to produce a current.

Explanation:

Battery is a source of constant potential difference

When a charge is passed through the battery then its potential energy changes by

$\Delta U = Q\Delta V$

here we know that

$\Delta V$ = potential difference of battery

so as the charge is passing through the terminals of battery its potential energy is changed by above value.

Now by the conservation of energy principle we know that this change in potential energy will convert into kinetic energy of charge and then the flow of charge will produce current in the circuit.

So battery is used to maintain a constant current in the circuit by giving potential energy to the charge.

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4. A 1500 kg car is rolling at 2.0 m/s. You would like to stop the car by firing a 10 kg blob ofsticky clay at it. How fast should you fire the clay?

Answers

The clay must be 300 m/s fast in other to stop the car.

For the car to stop, The momentum of the car must be equal to the momentum of the clay.

Formula:

MV = mv................. Equation 1

Where:

M = mass of the car
V = Velocity of the car
m = mass of the clay
v = velocity of the clay

Make v the subject of the equation.

v = MV/m................... Equation 2

From the question,

Given:

M = 1500 kg
V = 2 m/s
m = 10 kg

Substitute these values into equation 2

v = 1500(2)/10
v = 300 m/s.

Hence, The clay must be 300 m/s fast in other to stop the car.

Learn more about momentum here: brainly.com/question/7973509

Final answer:

To stop the car rolling at 2.0 m/s with a blob of clay, you should fire the blob of clay at a speed of 300 m/s. This is based on the principle of conservation of momentum.

Explanation:

The question involves a principle of Physics called the law of conservation of momentum. The law states that the total momentum of a system remains constant if no external forces act on it. Here, the car and the clay are the two objects in the system.

At the start, only the car has momentum, which can be calculated with the equation: momentum = mass x velocity => momentum of car = 1500 kg x 2 m/s = 3000 kg m/s.

After the clay is fired at the car, the total momentum of the system (car + clay) still remains 3000 kg m/s, but now the momentum is shared between them. We want to stop the car, so it will now have no momentum, meaning all momentum must be with the clay.

The equation again turns to momentum = mass x velocity => velocity = momentum/mass => velocity of clay = 3000 kg m/s / 10 kg = 300 m/s.

You should fire the clay at 300 m/s to stop the car.

Learn more about the Law of Conservation of Momentum here:

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Which contributes to acid rain? A. solar power

B. burning fossil fuels

C. nuclear power

D. hydroelectric power

Answers

The answer is D. hydroelectric power

Lightning strikes 16,090 meters away from you.How long does it take the sound of thunder to get to you at 20°C temperature?

with solution and formula<3

Answers

Final answer:

It takes approximately 47 seconds for the sound of thunder to reach you at 20°C temperature.

Explanation:

The time it takes for the sound of thunder to reach you can be determined using the formula:

Time = Distance / Speed

Sound travels at a speed of approximately 343 meters per second at 20°C. Therefore, to calculate the time it takes for the sound to reach you, divide the distance by the speed:

Time = 16,090 meters / 343 meters per second

Time = 46.97 seconds

So, it takes approximately 47 seconds for the sound of thunder to reach you at 20°C temperature.

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Assume that all four H-R diagrams below represent a star in different stages of its life, after it starts to fuse hydrogen in its core. Rank the HR diagrams based on when each stage occurs, from first to last.

Answers

Answer and explanation;

-The diagram at the left represents the Sun (or any other one-solar-mass star) as a hydrogen-burning main-sequence star, with spectral type G and one solar luminosity. The next diagram shows the Sun after it has exhausted its core hydrogen and left the main sequence, making it a sub-giant with energy generated by hydrogen burning in a shell around an inert helium core.

-The third diagram shows the Sun a little later; its energy source is still hydrogen shell burning, but at this point it has expanded in size so much that it is a red giant. The final diagram (far right) shows the white dwarf corpse of a one-solar-mass star; it is hot because it is the exposed core of the dead star, but dim because it is small in size.

The right answer for the question that is being asked and shown above is that: "1-4-3-2." (main sequence-->red giant-->supergiant-->white dwarf). Assume that all four H-R diagrams below represent a star in different stages of its life, after it starts to fuse hydrogen in its core.

Which one of the following choices best describes an advantage of isometric exercise? A. Rapid strength improvement
B. Improved strength across the entire range of motion
C. Improved joint flexibility
D. Motivational

Answers

Answer: C. Improved joint flexibility

Explanation:

Isometric exercises are the exercises which involves the contraction of particular muscles or group of muscles. In these exercises the muscles do not change their length and the joints does not move. These are the exercises which are done in one position. These exercises are performed in order to obtain strength during training exercises during which the muscle length and joint angles do not basically change. These exercises are high intensity exercises and contributes to the building of muscles and burning of fat.

On the basis of the above information, A. Rapid strength improvement is the correct option.

Final answer:

The primary advantage of isometric exercise is rapid strength improvement in a specific area, not necessarily improved flexibility or range of motion.

Explanation:

The best answer that describes an advantage of isometric exercise is A. Rapid strength improvement. Isometric exercises are often used for rehabilitation and building strength, as they involve the contraction of a specific set of muscles in a static position. This type of exercise does not involve the muscle changing length or the joint angle changing, which allows for an increase in strength in a very focused manner.

This does not necessarily mean that isometric exercises enhance joint flexibility (C) or improve strength across the entire range of motion (B) as the movement is static. The motivation aspect (D) can differ from person to person, but it's not a direct physical benefit of isometric exercises.

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A kettle transfers 1500 J of energy, 1200 J to a thermal energy store and 300 J to a vibrational energy store (sound). How efficient is the kettle?

Answers

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Final answer:

To calculate the efficiency of the kettle, divide the useful output energy (1200 J) by the total input energy (1500 J) and multiply by 100%. This results in an efficiency of 80%, meaning 80% of the energy was converted into useful thermal energy.

Explanation:

In order to find the efficiency of the kettle, we need to compute the ratio of the useful output energy to the total input energy and then multiply by 100% to convert the decimal to a percentage. In this case, the useful output energy is the 1200 J transferred to the thermal energy store. The total input energy is the total energy transferred by the kettle which is 1500 J. So, the efficiency of the kettle is (1200 J / 1500 J) * 100% = 80%.

The remaining 20% energy is wasted and was transferred to the vibrational (sound) energy store, which is a non-useful energy output. An efficient appliance is one which converts a higher proportion of the input energy into useful output energy, with less of it wasted. In this case, 80% of the energy from the kettle was converted into useful thermal energy, hence the kettle is quite efficient.