# HW4a - Version One – Homework 4 – savrasov – 39822...

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Unformatted text preview: Version One – Homework 4 – savrasov – 39822 – Oct 24, 2007 1 This print-out should have 10 questions. Multiple-choice 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 07:02, 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: Work Done on a Block 07:03, trigonometry, numeric, > 1 min, nor- mal. 002 (part 1 of 1) 1 points Lee pushes horizontally with a force of 80 N on a 20 kg mass for 10 m across a floor. Calculate the amount of work Lee did. Correct answer: 800 J. Explanation: Themassoftheobjectisignoredsincethere is no friction present. Thus W = Fd = (80 N)(20 kg) = 800 J keywords: Serway CP 05 02 07:05, trigonometry, numeric, > 1 min, nor- mal....
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## This note was uploaded on 01/10/2010 for the course PHY na taught by Professor Richardscalettar during the Fall '09 term at UC Davis.

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HW4a - Version One – Homework 4 – savrasov – 39822...

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