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Unformatted text preview: ikram (ai2734) – hw1008 – Swinney – (58785) 1 This printout should have 12 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. These problems apply the conceptz of Po tential Energy and the Conservation of En ergy Principle, which are crucial in all areas of science and engineering. In addition, some the problems in this homework illustrate that insight into the behavior of a system can of ten be gained from graphs of the potential energy as a function of a parameter (usually position). 001 (part 1 of 3) 10.0 points A 1.48 kg ball is attached to a ceiling by a 1.38 m long string. The height of the room is 3.44 m. The acceleration of gravity is 9 . 81 m / s 2 . What is the gravitational potential energy associated with the ball relative to a) the ceiling? Correct answer: 20 . 0359 J. Explanation: Basic Concept: U g = mgh Given: m = 1 . 48 kg h 1 = 1 . 38 m g = 9 . 81 m / s 2 Solution: U g = mg ( h 1 ) = (1 . 48 kg)(9 . 81 m / s 2 )( 1 . 38 m) = 20 . 0359 J 002 (part 2 of 3) 10.0 points b) the floor? Correct answer: 29 . 9087 J. Explanation: Given: h 2 = 3 . 44 m Solution: U g = mg ( h 2 h 1 ) = (1 . 48 kg)(9 . 81 m / s 2 )(3 . 44 m 1 . 38 m) = 29 . 9087 J 003 (part 3 of 3) 10.0 points c) a point at the same elevation as the ball? Correct answer: 0 J. Explanation: Given: h 3 = 0 m Solution: U g = mgh 3 = (1 . 48 kg)(9 . 81 m / s 2 )(0 m) = 0 J 004 10.0 points A student in Denver (altitude = 1 mile = 1609 m above sea level) brings a physics book of mass 1 . 9 kg to the top of a ten story building...
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This note was uploaded on 02/02/2010 for the course PHY 301 taught by Professor Swinney during the Spring '07 term at University of Texas.
 Spring '07
 Swinney
 mechanics, Energy, Potential Energy

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