1. Which of the following is an example of recycled energy? A. Connecting cable

ID: 1872259 • Letter: 1

Question

1. Which of the following is an example of recycled energy?

A. Connecting cable cars in San Francisco by power lines under the street so cable cars going downhill can transfer energy to cable cars going uphill

B. Using “cast off heat” from generators in power plants to warm nearby homes and businesses.

C. Both A and B

D. Neither A nor B

2. Which of the following is NOT an example of a person doing work on an object?

A. A teacher pulls a wheeled book bag down a hallway.

B. A man pushes a stalled car into his driveway.

C. A hiker walks along a flat trail carrying a pack on his back.

D. A librarian returns a book to the shelf.

3. If your friend pushes a lawnmower 6 times as far while exerting only 1/3 the force, which of you does more work? How much more?

A. You, 3 times the work. B. Your friend, 3 times the work.

C. Your friend, 2 times the work. D. Your friend, 6 times the work.

4. An airplane is slowing and descending to land on the runway. Which of the following statements is true?

A. Potential energy is decreasing and kinetic energy is increasing.

B. Potential energy is decreasing and kinetic energy is also decreasing.

C. Potential energy is increasing and kinetic energy is decreasing.

D. Potential energy is increasing and kinetic energy is also increasing.

5. When the speed of a moving car is doubled, how much more kinetic energy does it have?

A. 2 times B. the same C. 4 times D. Actually, it has ½ the KE

1) C) Both A and B

2) C) A hiker walks along a a flat trail wearing on his back.

3) C) Your friend, 2 time the work.

4) B) Potential energy is decreasing and kinetic energy is also decreasing.

5) C) 4times.

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