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PH101 HW Energy 2

# PH101 HW Energy 2 - This print-out should have 11 questions...

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This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points Consider the following systems: I) water behind a dam; II) a swinging pendulum; III) an apple on an apple tree; IV) the space shuttle in orbit. In which of the systems is potential energy present? 1. I, II and III 2. II, III and IV 3. I, II, III and IV correct 4. II and IV 5. I and II Explanation: All the systems have potential energy. 002 (part 2 of 2) 10.0 points In which of the systems is kinetic energy present? 1. II and IV correct 2. II, III and IV 3. I and II 4. I, II and III 5. I, II, III and IV Explanation: Moving objects have kinetic energy. 003 10.0 points Water flows over Victoria Falls, which is 128 m high, at an average rate of 1 . 49 × 10 6 kg/s. The acceleration of gravity is 9 . 81 m / s 2 . If half the potential energy of this water were converted into electric energy, how much power would be produced by these falls? Correct answer: 935 . 482 MW. Explanation: Let : Δ m Δ t = 1 . 49 × 10 6 kg / s , h = 128 m m , and g = 9 . 81 m / s 2 . P = Δ W Δ t = - Δ U Δ t = - 1 2 Δ ( m g h ) Δ t = - 1 2 g h Δ m Δ t = - 1 2 (9 . 81 m / s 2 ) ( - 128 m) × (1 . 49 × 10 6 kg / s) · MW 10 6 W = 935 . 482 MW . 004 10.0 points A spring has a force constant of 70000 N / m.

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PH101 HW Energy 2 - This print-out should have 11 questions...

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