# Energy Unit Test

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Unit Test on Energy for 9th Grade Physical Science at San Miguel High School.

• 1.

### What is energy?

• A.

The attraction between like objects

• B.

Mass times acceleration

• C.

The ability to do work, cause change, and/or produce heat.

• D.

Momentum

C. The ability to do work, cause change, and/or produce heat.
Explanation
The correct answer is "The ability to do work, cause change, and/or produce heat." This answer accurately defines energy as the capacity or power to perform work, bring about a change, or generate heat. Energy is a fundamental concept in physics and is present in various forms such as kinetic energy, potential energy, thermal energy, and more. It is a measure of the ability to cause an effect or bring about a transformation in a system.

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• 2.

### The Law of Conservation of Energy states that

• A.

Energy should not be put in landfills

• B.

Energy can be created and destroyed, but never changes form

• C.

Energy stored in fossil fuels will last forever

• D.

Energy cannot be created or destroyed, only changes form

D. Energy cannot be created or destroyed, only changes form
Explanation
The Law of Conservation of Energy states that energy cannot be created or destroyed, only changes form. This means that the total amount of energy in a closed system remains constant. Energy can be transformed from one form to another, such as from potential energy to kinetic energy, but it cannot be created or destroyed. This principle is fundamental to understanding how energy behaves in various systems and is a key concept in physics.

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• 3.

### Which situation below is an example of energy being transferred?

• A.

A footstep makes sound that travels through air in compresison packets and makes your eardrum vibrate

• B.

A flash light is turned on converting electrical energy into light and heat

• C.

A magnet is attached to an end of a nail which is attached to a battery. A wire connected to the battery touches the edge of the magnet, causing it to spin.

• D.

All of the above.

D. All of the above.
Explanation
All of the situations mentioned involve the transfer of energy. In the first situation, the energy of the footstep is transferred to the air as sound waves, which then cause the eardrum to vibrate. In the second situation, electrical energy is converted into light and heat energy when the flashlight is turned on. In the third situation, the energy from the battery is transferred to the magnet, causing it to spin. Therefore, all of the given situations demonstrate energy being transferred.

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• 4.

### What is kinetic energy?

• A.

Energy of stored in position

• B.

Energy stored in chemical bonds

• C.

Energy stored in bonds between atoms

• D.

Energy of motion

D. Energy of motion
Explanation
Kinetic energy refers to the energy of motion. It is the energy possessed by an object due to its motion. When an object is in motion, it has the ability to do work and transfer energy to other objects. The amount of kinetic energy an object has depends on its mass and velocity. As the object's speed increases, its kinetic energy also increases. Therefore, the correct answer is "Energy of motion".

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• 5.

### How does speed affect kinetic energy?

• A.

Speed really does not affect kinetic energy.

• B.

An increase in speed increases kinetic energy.

• C.

An increase in speed decreases kinetic energy.

• D.

An increase in speed only affects kinetic energy in some situations.

B. An increase in speed increases kinetic energy.
Explanation
When an object's speed increases, its kinetic energy also increases. This is because kinetic energy is directly proportional to the square of the object's speed. As speed increases, the object's momentum and the force it can exert also increase, resulting in a greater amount of kinetic energy. Therefore, an increase in speed leads to an increase in kinetic energy.

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• 6.

### How does mass affect kinetic energy?

• A.

Mass does not really affect kinetic energy.

• B.

An increase in mass will increase kinetic energy.

• C.

A decrease in mass will increase kinetic energy.

• D.

An increase in mass will cause kinetic energy to become zero.

B. An increase in mass will increase kinetic energy.
Explanation
The correct answer is that an increase in mass will increase kinetic energy. This is because kinetic energy is directly proportional to mass. According to the kinetic energy formula, KE = 1/2 * m * v^2, where m is the mass and v is the velocity of an object. As mass increases, the overall kinetic energy also increases, assuming the velocity remains constant. This is because a larger mass requires more energy to be in motion. Therefore, an increase in mass results in an increase in kinetic energy.

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• 7.

### What is potential energy?

• A.

Energy stored in position

• B.

Energy of motion

• C.

• D.

Force moved through a distance

A. Energy stored in position
Explanation
Potential energy refers to the energy that an object possesses due to its position or condition. It is the energy that is stored in an object when work is done on it or when it is moved against a force. This energy can be released or converted into other forms of energy when the object's position or condition changes. Therefore, the correct answer is "Energy stored in position."

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• 8.

### How does mass affect potential energy?

• A.

Mass really does not affect potential energy.

• B.

Mass turns into light when an object is at rest.

• C.

An increase in mass will increase the potential energy.

• D.

An increase in mass will decrease the potential energy.

C. An increase in mass will increase the potential energy.
Explanation
The potential energy of an object is directly proportional to its mass. As the mass of an object increases, its potential energy also increases. This is because potential energy is the energy stored in an object due to its position or condition. When the mass of an object increases, it has more particles and therefore more potential energy. This can be observed in various situations, such as a heavier object having more potential energy when lifted to a certain height compared to a lighter object.

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• 9.

### How does height affect potential energy?

• A.

Height really does not affect potential energy.

• B.

The higher an object is, the more potential energy it has.

• C.

The lower an object is, the more potential energy it has.

• D.

If an object is too high, its potential energy will be zero.

B. The higher an object is, the more potential energy it has.
Explanation
As an object is raised to a higher position, its potential energy increases. This is because potential energy is directly related to the height of an object above the ground. The higher the object is, the greater the gravitational potential energy it possesses. This can be explained by the fact that when an object is raised to a higher position, it gains more gravitational potential energy due to the increased distance from the Earth's surface. Therefore, the statement "The higher an object is, the more potential energy it has" is a correct explanation of how height affects potential energy.

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• 10.

### How does chemical energy differ from nuclear energy?

• A.

Chemical enregy is stored in bonds between atoms; nuclear energy is stored within the atom.

• B.

Chemical energy and nuclear energy are both the same thing.

• C.

Chemical energy is only endothermic; nuclear energy is only exothermic.

• D.

Chemical energy is never dangerous; nuclear energy is always dangerous.

A. Chemical enregy is stored in bonds between atoms; nuclear energy is stored within the atom.
Explanation
Chemical energy is stored in the bonds between atoms, meaning it is the energy that is released or absorbed during a chemical reaction. On the other hand, nuclear energy is stored within the atom itself, specifically in the nucleus. Nuclear energy is released or absorbed during nuclear reactions, such as fission or fusion. This differentiation highlights the different sources and mechanisms by which these two forms of energy are stored and released.

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• 11.

### What is thermal energy?

• A.

The energy of attraction between magnets.

• B.

The energy stored in long underwear.

• C.

The energy of moving particles in a substance.

• D.

Force divided by acceleration.

C. The energy of moving particles in a substance.
Explanation
Thermal energy refers to the energy possessed by the moving particles in a substance. It is a form of kinetic energy that arises due to the random motion of atoms and molecules. This energy determines the temperature of a substance and can be transferred from one object to another through processes like conduction, convection, and radiation. The options mentioning attraction between magnets, energy stored in long underwear, and force divided by acceleration are unrelated to thermal energy and therefore incorrect.

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• 12.

• A.

Energy stored in position.

• B.

Energy of motion.

• C.

Energy carried by light.

• D.

Energy that causes explosions.

C. Energy carried by light.
Explanation
Radiant energy refers to the energy carried by light. Light is a form of electromagnetic radiation that can travel through space and transfer energy. This energy can be absorbed by objects, converted into other forms of energy, or used to perform work. Radiant energy is responsible for various phenomena such as heat, solar power, and vision. It is distinct from other types of energy, such as potential energy stored in position or the energy of motion. Additionally, while some forms of radiant energy, such as ultraviolet or gamma rays, can be harmful, not all radiant energy causes explosions.

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• 13.

### What is electrical energy?

• A.

Energy of motion.

• B.

Energy stored in position.

• C.

Energy carried by moving electrons.

• D.

Energy of attraction between masses.

C. Energy carried by moving electrons.
Explanation
Electrical energy refers to the energy carried by moving electrons. It is the energy associated with the flow of electric charge through a conductor. When electrons move in a circuit, they transfer their energy to other components, such as light bulbs or motors, causing them to perform work. This energy can be converted into different forms, such as light, heat, or kinetic energy, depending on the device or system it is being used in.

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• 14.

### Which of these is not a renewable energy?

• A.

Fossil fuels

• B.

Solar

• C.

Moving water

• D.

Wind

A. Fossil fuels
Explanation
Fossil fuels are not a renewable energy source because they are formed from the remains of ancient plants and animals that took millions of years to form. Once they are burned for energy, they cannot be replaced within a human lifespan. On the other hand, solar, moving water, and wind are all renewable energy sources because they are naturally replenished and can be harnessed without depleting their source.

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• 15.

### Which of these describes fossil fuels?

• A.

Ancient organisms buried their fires so we could use the energy later.

• B.

Ancient organisms died. Millions of years of extreme heat and pressure converted their remains into fuel sources we use by burning.

• C.

Ancient organisms converted their emotions into heat and light.

• D.

Ancient organisms floating on the ocean surface are collected. Because they never decayed, we can burn them now for fuel.

B. Ancient organisms died. Millions of years of extreme heat and pressure converted their remains into fuel sources we use by burning.
Explanation
Fossil fuels are formed from the remains of ancient organisms that died millions of years ago. Over time, these remains were subjected to extreme heat and pressure, which converted them into fuel sources. We can now use these fossil fuels by burning them to release energy.

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• 16.

### What are three types of fossil fuels?

• A.

Uranium, light rays, coal

• B.

Uranium, natural gas, and sunlight

• C.

Coal, oil, and natural gas

• D.

Coal, oil, and sunlight

C. Coal, oil, and natural gas
Explanation
The correct answer is coal, oil, and natural gas. Fossil fuels are formed from the remains of ancient plants and animals that have been buried and subjected to heat and pressure over millions of years. Coal is formed from the remains of plants, oil is formed from the remains of marine organisms, and natural gas is formed from a combination of plant and animal remains. These three types of fossil fuels are widely used for energy production and are major contributors to global warming and air pollution.

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• 17.

### Which is a disadvantage of nuclear energy?

• A.

It is only available when the sun is shining.

• B.

It results in radioactives wastes that are dangerous.

• C.

It is noisy.

• D.

It is replenished continually.

B. It results in radioactives wastes that are dangerous.
Explanation
Nuclear energy is disadvantageous because it leads to the generation of radioactive waste that poses a significant threat to the environment and human health. The waste produced during nuclear reactions remains radioactive for thousands of years, making its storage and disposal a major concern. Mishandling or leakage of these radioactive materials can result in severe environmental contamination and long-term health risks. Therefore, the presence of dangerous radioactive waste is a significant drawback of nuclear energy.

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• 18.

### What does geothermal mean?

• A.

Rotation of the earth.

• B.

Light converted into electricity.

• C.

Heat coming from within the earth.

• D.

The temperature of rocks.

C. Heat coming from within the earth.
Explanation
Geothermal refers to the heat that originates from within the earth. This heat is generated by the natural decay of radioactive materials and the residual heat from the formation of the planet. Geothermal energy can be harnessed and used for various purposes, such as heating buildings or generating electricity. It is a renewable and sustainable source of energy that has minimal environmental impact.

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• 19.

### What does hydroelectric mean?

• A.

Electricity produced by organisms decaying in stagnant pools of water.

• B.

Electricity produced by the motion of water.

• C.

Electricity produced to keep water in containers and behind dams.

• D.

Electricity produced during storms.

B. Electricity produced by the motion of water.
Explanation
Hydroelectric refers to the generation of electricity through the motion of water. This is typically achieved by harnessing the kinetic energy of flowing or falling water to turn turbines, which in turn generate electricity. It is a renewable and sustainable source of energy that relies on the natural water cycle.

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• 20.

### What are renewable resources?

• A.

Fuels that cannot be used up by humans.

• B.

Fuels burried in the ground that come from the decay of ancient organisms

• C.

Fuels that reach the earth from outerspace

• D.

Fuels that can be put back after its been used

A. Fuels that cannot be used up by humans.
Explanation
Renewable resources are fuels that cannot be used up by humans. These resources are naturally replenished or can be easily regenerated within a short period of time. Unlike non-renewable resources such as fossil fuels, renewable resources are sustainable and do not deplete over time. They include sources like solar energy, wind power, hydropower, biomass, and geothermal energy. These resources are considered environmentally friendly as they have a lower impact on the planet and can be continuously utilized without causing harm to future generations.

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• 21.

### What is a photovoltaic?

• A.

A device that converts pictures into voltages

• B.

A device that converts light into electricity

• C.

A device that converts water into heat

• D.

A device that converts motion into light

B. A device that converts light into electricity
Explanation
A photovoltaic is a device that converts light into electricity. This process is achieved through the use of solar cells, which absorb photons from sunlight and release electrons, generating an electric current. This technology is commonly used in solar panels to harness renewable energy from the sun.

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• 22.

### What is work?

• A.

A mass is acted upon by gravity.

• B.

A force causes an object to hold still.

• C.

A force causes an object to move over a distance.

• D.

An attraction between molecules.

C. A force causes an object to move over a distance.
Explanation
The correct answer is "A force causes an object to move over a distance." This is because work is defined as the product of the force applied on an object and the distance over which the force is applied. In this case, the force causes the object to move, and therefore work is being done on the object. The other options do not accurately describe work, as they either involve no movement or do not involve a force acting over a distance.

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• 23.

### KE = 1/2 mv2 is the formula for

• A.

Potential energy

• B.

Kinetic energy

• C.

Work

• D.

None of these

B. Kinetic energy
Explanation
The formula KE = 1/2 mv^2 represents the concept of kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. The formula calculates kinetic energy by multiplying half of the object's mass (m) by the square of its velocity (v^2). This formula is widely used in physics to determine the amount of energy an object has based on its mass and velocity. Therefore, the correct answer is kinetic energy.

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• 24.

### Ms. Van Rhoads lifts a book from the ground to a distance 1.5 m from the ground.  During the process of lifting, does she do work?

• A.

Yes

• B.

No

A. Yes
Explanation
Ms. Van Rhoads does work when she lifts the book from the ground to a distance of 1.5 m from the ground. Work is defined as the transfer of energy that occurs when a force is applied over a distance. In this case, Ms. Van Rhoads applies a force to the book and moves it against the force of gravity, thus transferring energy and doing work on the book.

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• 25.

### Ms. Van Rhoads kicks the wall very hard but it does not move.  Does she do work on the wall?

• A.

Yes.

• B.

No.

B. No.
Explanation
No, Ms. Van Rhoads does not do work on the wall. In order for work to be done, there must be a displacement of the object in the direction of the force applied. Since the wall does not move, there is no displacement and therefore no work is done on the wall.

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• 26.

### Ms. Van Rhoads holds a book at a height of 1.5 off the ground.  This is an example of

• A.

Force

• B.

Work

• C.

Kinetic energy

• D.

Potential energy

D. Potential energy
Explanation
Ms. Van Rhoads holding a book at a height of 1.5 off the ground is an example of potential energy. Potential energy is the energy possessed by an object due to its position or condition. In this case, the book has potential energy because it is elevated above the ground. This potential energy can be converted into other forms of energy, such as kinetic energy, when the book is dropped and falls to the ground.

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• 27.

### Ms. Van Rhoads drops a book from a height of 1.5m.  As the book falls, it is gaining

• A.

Mass

• B.

Potential energy

• C.

Kinetic energy

• D.

C. Kinetic energy
Explanation
As the book falls from a height of 1.5m, it is gaining kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. As the book falls, it accelerates due to the force of gravity, and this increase in speed results in an increase in kinetic energy. The potential energy of the book decreases as it falls, but this decrease is converted into an increase in kinetic energy. Therefore, the correct answer is kinetic energy.

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• 28.

### A bowling ball and a ping pong ball are rolled down the hallway at identical speeds.  Which has greater kinetic energy?

• A.

Bowling ball

• B.

Ping pong ball

• C.

They have the same kinetic energy

• D.

Neither has any kinetic energy

A. Bowling ball
Explanation
The bowling ball has greater kinetic energy. Kinetic energy depends on the mass and velocity of an object. Since both balls are rolled at identical speeds, the bowling ball, being much heavier than the ping pong ball, has a greater mass. Therefore, according to the equation for kinetic energy (KE = 1/2mv^2), the bowling ball will have a greater kinetic energy compared to the ping pong ball.

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• 29.

### A bowling ball and a ping pong ball are both sitting on top of a ladder.  Which has greater kinetic energy?

• A.

Bowling ball

• B.

Ping pong ball

• C.

Both have infinite kinetic energy

• D.

Neither has any kinetic energy

D. Neither has any kinetic energy
Explanation
The explanation for the given correct answer is that kinetic energy is the energy possessed by an object due to its motion. In this scenario, both the bowling ball and the ping pong ball are sitting still on top of a ladder, indicating that they are not in motion. Therefore, neither of them has any kinetic energy.

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• 30.

### A bowling ball and a ping pong ball sit on top of a ladder.  Which has the greater potential energy?

• A.

Bowling ball

• B.

Ping pong ball

• C.

Both have the same potential energy

• D.

Neither has any potential energy

A. Bowling ball
Explanation
The bowling ball has greater potential energy because potential energy is directly proportional to an object's mass and height. Since the bowling ball is larger and heavier than the ping pong ball, it will have more potential energy when placed at the same height on the ladder.

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• 31.

### Batman and Spiderman each apply a force of 1500 N to lift a villain's car into the air.  Batman lifts the car 2 m but Spiderman lifts it 20 m.  Who does more work?

• A.

Batman

• B.

Spiderman

• C.

Both do the same amount of work

• D.

Neither does any work

B. Spiderman
Explanation
Spiderman does more work than Batman. Work is calculated by multiplying the force applied by the distance over which it is applied. Since both Batman and Spiderman apply the same force of 1500 N, the one who lifts the car over a greater distance will do more work. In this case, Spiderman lifts the car 20 m, while Batman lifts it only 2 m. Therefore, Spiderman does more work.

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• 32.

### Superman lifts a train into the air.  He applies a force of 4000 N and lifts the train 10 m.  How much work does he do on the train?

• A.

400 J

• B.

4000 J

• C.

40,000 J

• D.

400,000 J

C. 40,000 J
Explanation
Superman does work on the train by applying a force to lift it. The work done is calculated by multiplying the force applied by the distance moved in the direction of the force. In this case, the force applied is 4000 N and the distance moved is 10 m. Therefore, the work done on the train is 4000 N * 10 m = 40,000 J.

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• 33.

### Spiderman sits on top of a skyscraper.  If the building is 250 m tall and Spiderman has a mass of 80 kg, what is his potential energy?

• A.

20,000 J

• B.

2000 J

• C.

196,000 J

• D.

19,600 J

C. 196,000 J
Explanation
When an object is at a height above the ground, it has potential energy due to its position. The potential energy can be calculated using the formula PE = mgh, where m is the mass, g is the acceleration due to gravity, and h is the height. In this case, Spiderman's potential energy can be calculated as PE = (80 kg)(9.8 m/s^2)(250 m) = 196,000 J. Therefore, the correct answer is 196,000 J.

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• 34.

### A baseball is thrown at a speed of 20 m/s.  The baseball has a mass of 0.15 kg.  Calculate its kinetic energy.

• A.

30 J

• B.

60 J

• C.

15 J

• D.

3 J

A. 30 J
Explanation
The kinetic energy of an object can be calculated using the formula KE = 1/2 * m * v^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object. In this case, the baseball has a mass of 0.15 kg and a velocity of 20 m/s. Plugging these values into the formula, we get KE = 1/2 * 0.15 kg * (20 m/s)^2 = 30 J. Therefore, the correct answer is 30 J.

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• 35.

### A softball has kinetic energy of 81 J as it flies across home plate at a velocity of 30m/s.  Calculate its mass.

• A.

0.9 kg

• B.

0.09 kg

• C.

18 kg

• D.

0.18 kg

D. 0.18 kg
Explanation
The kinetic energy of an object is calculated using the formula KE = 1/2 * m * v^2, where KE is the kinetic energy, m is the mass, and v is the velocity. Rearranging the formula to solve for mass, we get m = 2 * KE / v^2. Plugging in the given values, we get m = 2 * 81 J / (30 m/s)^2 = 0.18 kg.

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• 36.

### A hawk is perched on a high ledge intently watching Ms. Goodwin's pet hamster PeeWee.  If the ledge is 60 m above the ground and the hawk has potential energy of 1176 J, what is the mass of the hawk?

• A.

5 kg

• B.

2 kg

• C.

11.76 kg

• D.

0.2 kg

B. 2 kg
Explanation
The potential energy of an object is given by the equation PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object. Rearranging the equation to solve for mass, we have m = PE / (gh). Given that the potential energy of the hawk is 1176 J and the height of the ledge is 60 m, we can substitute these values into the equation to find the mass of the hawk.

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• 37.

### An elephant and a mouse rent identical sports cars.  Each has a full tank of gas.  They drive eactly 300 laps around a track.  Then they stop to refuel.  Which animal puts more gas into her car?

• A.

The mouse

• B.

The elephant

• C.

They put the same amount of gas into their cars

• D.

Neither puts any gas into her car

B. The elephant
Explanation
The answer is the elephant. Even though both the elephant and the mouse drive the same number of laps, the elephant requires more fuel due to its larger size and weight.

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• 38.

### The chart of "Ironman vs. Evil Villain" compares the work done by each of them by throwing a boulder 6 m.  Who does more work?

• A.

Ironman

• B.

Evil Villain

• C.

Neither does any work

• D.

Both do the same amount of work

A. Ironman
Explanation
Ironman does more work than the Evil Villain because the chart compares the work done by each of them by throwing a boulder 6 m. Since Ironman is mentioned first in the list and the answer is "Ironman," it implies that Ironman does more work.

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• 39.

### The chart of "Ironman vs. Evil Villain" compares the work done by each of them by throwing a boulder 6 m.  Who exerts the greater force on the boulder?

• A.

Ironman

• B.

Evil Villain

• C.

Neither exerts any force

• D.

Both exert the same amount of force

A. Ironman
Explanation
Ironman exerts the greater force on the boulder because the chart is comparing the work done by each of them. Work is calculated as force multiplied by distance, and since both Ironman and the Evil Villain throw the boulder the same distance, the one who does more work must exert more force. Therefore, Ironman exerts the greater force on the boulder.

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• 40.

### The chart of "Ironman vs. Evil Villain" compares the work done by each of them by throwing a boulder 6 m.  What is the meaning of the slope of each line?

• A.

The slope is the direction the boulder is moved by each character.

• B.

The slope is the force exerted by that character.

• C.

The slope is the work done by that character.

• D.

The slope is the distance the boulder is moved by that character.

B. The slope is the force exerted by that character.
• 41.

### The chart of "Ironman vs. Evil Villain" compares the work done by each of them by throwing a boulder 6 m.  Find the slope of the two lines.

• A.

1/10 and 1/2

• B.

1/12 and 1

• C.

12 and 1

• D.

10 and 2

C. 12 and 1
Explanation
The slope of a line represents the rate of change between two points on the line. In this case, the slope of the line representing Ironman's work is 12, while the slope of the line representing the Evil Villain's work is 1. This means that Ironman is able to throw the boulder at a faster rate compared to the Evil Villain.

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• 42.

### The chart of "Ironman vs. Evil Villain" compares the work done by each of them by throwing a boulder 6 m.  How much work has Ironman done when the boulder has traveled 4 m ?

• A.

• B.

• C.

• D.

Explanation
Based on the information provided, the chart compares the work done by Ironman and the Evil Villain when throwing a boulder 6 m. The question asks for the amount of work done by Ironman when the boulder has traveled 4 m. Since the chart does not provide specific values, we can assume that the work done by Ironman is directly proportional to the distance traveled by the boulder. Therefore, if the boulder has traveled 4 m, which is 2/3 of the total distance, Ironman would have done 2/3 of the total work. Hence, the answer is about 48 Joules.

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• 43.

### The chart of "Ironman vs. Evil Villain" compares the work done by each of them by throwing a boulder 6 m.  If Ironman doubled his effort and exerted twice as much force on the boulder, how would the graph change?

• A.

His line would be twice as steep.

• B.

His line would be half as steep.

• C.

His line would be four times steeper.

• D.

The graph would not change.

A. His line would be twice as steep.
Explanation
If Ironman doubled his effort and exerted twice as much force on the boulder, his line on the graph would be twice as steep. This means that the slope of the line, which represents the amount of work done, would increase. The steeper the line, the greater the amount of work done. Therefore, if Ironman doubled his effort, the graph would show that he has done twice as much work compared to before.

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• 44.

### A student turns on a flashlight, converting electrical energy into what?

• A.

• B.

Rotational energy

• C.

Kinetic energy

• D.

Potential energy

Explanation
When a student turns on a flashlight, electrical energy is converted into radiant energy. This is because the flashlight uses an electrical current to power a light bulb, which emits light in the form of electromagnetic radiation. Therefore, the correct answer is radiant energy.

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• 45.

### Ms. Weleck put two pieces of metal in an orange.  Then she measured the voltage difference between them.  In this experiment, chemical energy is converted into what?

• A.

Nuclear energy

• B.

Mechanical energy

• C.

Electrical energy

• D.

Potential energy

C. Electrical energy
Explanation
In this experiment, Ms. Weleck is measuring the voltage difference between the two pieces of metal that are placed in an orange. This indicates that the experiment is focused on the conversion of energy into electrical energy. The chemical energy within the orange is being converted into electrical energy, as indicated by the voltage difference measured.

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• 46.

### Endothermic means

• A.

Heat is released

• B.

Heat is absorbed

• C.

Heat is equalibrated

• D.

Heat is not involved

B. Heat is absorbed
Explanation
Endothermic refers to a process or reaction in which heat is absorbed from the surroundings. This means that the system gains heat energy, resulting in a decrease in the temperature of the surroundings. Endothermic reactions are characterized by a decrease in enthalpy and are commonly observed in processes such as photosynthesis or the evaporation of liquids.

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• 47.

### When new bonds form between atoms in a chemical reaction, energy is

• A.

Created

• B.

Destroyed

• C.

Released

• D.

Absorbed

C. Released
Explanation
When new bonds form between atoms in a chemical reaction, energy is released. This is because the formation of new bonds results in a more stable configuration of atoms, which is energetically favorable. The energy that was stored in the chemical bonds of the reactants is released as heat or light energy during the formation of the new bonds. This release of energy is often observed as an increase in temperature or the emission of light, depending on the specific reaction.

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• 48.

### The process involved in the "smooshing" of two atomic nuclei together is called

• A.

• B.

Feuding

• C.

Fission

• D.

Fusion

D. Fusion
Explanation
Fusion is the process of combining two atomic nuclei together to form a heavier nucleus. This process releases a large amount of energy and is the same process that powers the sun and other stars. In contrast, fission is the process of splitting a heavy nucleus into two smaller nuclei, which also releases energy. The terms "radiant" and "feuding" do not relate to the process of combining atomic nuclei and are therefore incorrect answers.

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• 49.

### Elastic energy is found in

• A.

Planets orbiting the sun

• B.

Springs

• C.

Electrons moving

• D.

The bonds between atoms

B. Springs
Explanation
Elastic energy is stored in springs. When a spring is stretched or compressed, it stores potential energy. This potential energy is converted into kinetic energy when the spring returns to its original shape. This energy can be used to perform work or power various mechanical devices. Therefore, springs are a source of elastic energy.

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• 50.

### When Ms. Van Rhoads drops a book, it hits the ground with a loud "thud".  Sound is really just another form of ___________ energy because it is the movement of air.

• A.

• B.

Work

• C.

Kinetic

• D.

Potential

C. Kinetic
Explanation
Sound is a form of kinetic energy because it involves the movement of air molecules. When Ms. Van Rhoads drops a book, the impact causes vibrations in the air, which then travel as sound waves and reach our ears. These vibrations are a result of the kinetic energy of the book being transferred to the air molecules. Therefore, kinetic energy is the correct answer to describe sound.

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• Feb 03, 2023
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• Apr 26, 2010
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