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Unformatted text preview: Version One – Homework 4 – Savrasov – 39820 – Oct 30, 2006 1 This printout should have 9 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Kinetic Energy of a Car 07:01, trigonometry, numeric, > 1 min, nor mal. 001 (part 1 of 1) 1 points A(n) 1600 kg car travels at a speed of 12 . 5 m / s. What is its kinetic energy? Correct answer: 125000 J. Explanation: Kinetic energy is K = 1 2 mv 2 = 1 2 (1600 kg)(12 . 5 m / s) 2 = 125000 J keywords: Drag a Crate 07:03, trigonometry, numeric, > 1 min, wordingvariable. 002 (part 1 of 3) 1 points Sally applies a horizontal force of 462 N with a rope to drag a wooden crate across a floor with a constant speed. The rope tied to the crate is pulled at an angle of 48 ◦ relative to the floor. The acceleration of gravity is 9 . 8 m / s 2 . m F 462 N 4 8 ◦ How much force is exerted by the rope on the crate? Correct answer: 690 . 448 N. Explanation: Given : F h = 462 N , and θ = 48 ◦ . The horizontal component of the force exerted by the rope is defined by cos θ = F h F so that F = F h cos θ = 462 N cos 48 ◦ = 690 . 448 N ....
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This note was uploaded on 03/22/2010 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.
 Spring '08
 Turner

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