Homework 6-solutions

Homework 6-solutions - pels (kcp389) Homework 6 hill (666)...

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Unformatted text preview: pels (kcp389) Homework 6 hill (666) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1 m, they both have the same 1. kinetic energy. 2. momentum. 3. change in potential energy. 4. inertia. 5. speed. correct Explanation: All of the quantities mentioned above ex- cept terminal velocity depend upon mass. Note: If this experiment had not taken place in a vacuum chamber, none of these answers would have been correct. 002 (part 1 of 4) 10.0 points Calculate the momentum for a 0 . 2 kg rifle bullet traveling 600 m / s. Correct answer: 120 kg m / s. Explanation: Let : m = 0 . 2 kg and v = 600 m / s . p = mv = (0 . 2 kg)(600 m / s) = 120 kg m / s . 003 (part 2 of 4) 10.0 points What momentum does a 1200 kg automobile traveling 0 . 5 m / s (a few miles per hour) have? Correct answer: 600 kg m / s. Explanation: Let : m = 1200 kg , and v = 0 . 5 m / s . p = (1200 kg)(0 . 5 m / s) = 600 kg m / s . 004 (part 3 of 4) 10.0 points What momentum does a 90 kg person running 8 m / s (a fast sprint) have? Correct answer: 720 kg m / s. Explanation: Let : m = 90 kg , and v = 8 m / s . p = (90 kg)(8 m / s) = 720 kg m / s . 005 (part 4 of 4) 10.0 points What momentum does a 13000 kg truck trav- eling 0 . 02 m / s (a slow roll) have? Correct answer: 260 kg m / s. Explanation: Let : m = 13000 kg , and v = 0 . 02 m / s . p = (13000 kg)(0 . 02 m / s) = 260 kg m / s . 006 10.0 points What is the momentum of a two-particle sys- tem composed of a 1000 kg car moving east at 50 m / s and a second 1500 kg car moving west at 35 m / s? Let east be the positive direction. Correct answer:- 2500 kg m / s. pels (kcp389) Homework 6 hill (666) 2 Explanation: Let : m 1 = 1000 kg , v 1 = 50 m / s , m 2 = 1500 kg , and v 2 = 35 m / s . Thus p = m 1 v 1 + m 2 v 2 = (1000 kg)(50 m / s) + (1500 kg)(- 35 m / s) =- 2500 kg m / s . 007 10.0 points A lunar vehicle is tested on Earth at a speed of 10 km/h. When it travels this fast on the moon, how does its momentum compare to the momen- tum on Earth? 1. None of these 2. the same as on Earth correct 3. less than on Earth 4. greater than on Earth Explanation: Its momentum is m v . Because its mass and speed do not change, its momentum on the moon is the same as that on Earth. 008 10.0 points When an apple falls from a tree and strikes the ground without bouncing, what happens to its momentum? 1. The speed of the apple is equal and oppo- site to the speed of the Earth....
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Homework 6-solutions - pels (kcp389) Homework 6 hill (666)...

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