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Unformatted text preview: kodeih (njk359) – HW 6 – Coker – (56625) 1 This printout should have 20 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. Homework on Chapter 7, which introduces the concepts of work, kinetic energy, gravi tational potential energy, conservation of en ergy, and inclusion of nonconservative forces such as friction in using energy concepts. A lot of stuff! 001 10.0 points An object with mass M is attached to the end of a string and is being lowered vertically at a constant acceleration of g 4 . If it has been lowered a distance ℓ from rest, how much work has been done by the tension in the string? 1. M g ℓ 4 2. 3 M g ℓ 4 3. M g ℓ 2 4. M g ℓ 2 5. M g ℓ 6. M g ℓ 7. M g ℓ 4 8. 3 M g ℓ 4 002 (part 1 of 4) 10.0 points A block of mass 2 . 11 kg is pushed 1 . 23 m along a frictionless horizontal table by a constant 16 N force directed 20 ◦ below the horizontal. 2 . 11 kg μ = 0 1 6 N 2 ◦ Find the work done by the applied force. Answer in units of J. 003 (part 2 of 4) 10.0 points Find the work done by the normal force ex erted by the table. Answer in units of J. 004 (part 3 of 4) 10.0 points Find the work done by the force of gravity. Answer in units of J. 005 (part 4 of 4) 10.0 points Find the work done by the net force on the block. Answer in units of J. 006 10.0 points An applied force varies with position ac cording to F = k 1 x n k 2 , where n = 3, k 1 = 4 . 7 N / m 3 , and k 2 = 66 N. How much work is done by this force on an object that moves from x i = 5 . 77 m to x f = 26 . 7 m?...
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This note was uploaded on 09/25/2010 for the course PHY 56640 taught by Professor Coker during the Fall '10 term at University of Texas.
 Fall '10
 COKER

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