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Unformatted text preview: reddy (ar38357) – Impulse and Momentum – clancy – (SCI4112) 1 This printout should have 11 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points On planet X, an object weighs 14 . 9 N. On planet B where the magnitude of the freefall acceleration is 2 g (where g = 9 . 8 m / s 2 is the gravitational acceleration on Earth), the object weighs 33 . 5 N. The acceleration of gravity is 9 . 8 m / s 2 . a) What is the mass of the object on planet X? Correct answer: 1 . 70918 kg. Explanation: Basic Concept The mass of the object is constant, regard less of the gravitational acceleration or the planet. Solution From Newton’s second law W B = mg B m = W B g B = 33 . 5 N (2) g = 1 . 70918 kg 002 (part 2 of 2) 10.0 points b) What is the freefall acceleration on planet X? Correct answer: 8 . 71761 m / s 2 . Explanation: The freefall acceleration on planet X is g x = W x m = 14 . 9 N 1 . 70918 kg = 8 . 71761 m / s 2 003 10.0 points A man weighs 1030 N on Earth. What would he weigh on Jupiter, where the freefall acceleration is 25 . 9 m / s 2 ? The acceleration of gravity is 9 . 8 m / s 2 . Correct answer: 2722 . 14 N. Explanation: The man’s weight on earth is given by W e = mg e m = W e g e = 1030 N 9 . 8 m / s 2 = 105 . 102 kg His weight on Jupiter will be W J = mg J = (105 . 102 kg) (25 . 9 m / s 2 ) = 2722 . 14 N . 004 10.0 points If one knows only the constant resultant force acting on an object and the time during which this force acts, one can determine the 1. change in kinetic energy of the object.change in kinetic energy of the object....
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This note was uploaded on 11/21/2010 for the course PHYS 12231 taught by Professor Sontar during the Fall '10 term at Ill. Chicago.
 Fall '10
 Sontar
 Physics, Impulse And Momentum

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