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Unformatted text preview: kodeih (njk359) – HW 6 – Coker – (56625) 1 This print-out should have 20 questions. Multiple-choice 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