Ques:Q: When someone falls, the kinetic energy the person has upon reaching the floor is the amount of what energy lost by falling through height? Read this paragraph and choose the correct option from the provided answers: with a minus sign because the displacement while stopping and the force from floor are in opposite directions (cos = cos 180 = 1) . The floor removes energy from the system, so it does negative work. The kinetic energy the person has upon reaching the floor is the amount of potential energy lost by falling through height. Choices: - gravitational energy - thermal energy - nuclear energy - potential energy A:

Ans:potential energy
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Ques:Q: What property is a measure of the average kinetic energy of molecules? Read this paragraph and choose the correct option from the provided answers: Temperature is a measure of the average kinetic energy of molecules. Consider a mixture of hydrogen and oxygen gas at a certain temperature. Use the formula for kinetic energy to explain why the hydrogen molecules move faster than the oxygen molecules. Then explain why there's no hydrogen in the earth's atmosphere, and why the moon has no atmosphere at all. Choices: - mass - velocity - density - temperature A:

Ans:temperature
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Ques:Q: What term is used to describe potential energy due to an object's shape? Read this paragraph and choose the correct option from the provided answers: Irrigation is the single biggest use of water. Overhead irrigation wastes a lot of water. Drip irrigation ( Figure below ) wastes a lot less. Water pipes run over the surface of the ground. Tiny holes in the pipes are placed close to each plant. Water slowly drips out of the holes and soaks into the soil around the plants. Very little of the water evaporates or runs off the ground. Choices: - stimulated potential energy - flexible energy - kinetic energy - elastic potential energy A:

Ans:elastic potential energy
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Ques:Q: Which is the ultimate energy source in a bear's food chain? Read this paragraph and choose the correct option from the provided answers: Bears get their energy from their food. Brown bears eat a varied diet, from nuts and berries to fish and other animals. When bears eat a berry, they are obtaining energy that the plant originally captured from the sun. Even when a bear eats another animal, the energy in that animal ultimately came from eating a producer that captured the sun's energy. Choices: - decomposers - plants - heat - sun A:

Ans:
sun
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