CW8 - boland (kbb544) CW8 mackie (10611) 1 This print-out...

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Unformatted text preview: boland (kbb544) CW8 mackie (10611) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points A block starts at rest and slides down a fric- tionless track except for a small rough area on a horizontal section of the track (as shown in the figure below). It leaves the track horizontally, flies through the air, and subsequently strikes the ground. The acceleration of gravity is 9 . 8 m / s 2 . =0 . 4 1 . 2 m b b b b b b b b b b b b 525 g 4 . 9m 1 . 9m x v What is the speed v of the block when it leaves the track? Correct answer: 7 . 02794 m / s. Explanation: Let : g = 9 . 8 m / s 2 , m = 525 g , = 0 . 4 , = 1 . 2 m , h = 4 . 9 m , h 2 =- 1 . 9 m , h 1 = h + h 2 =- 3 m , and v x = v . b b b b b b b b b b b b m h h 1 h 2 x g v Basic Concepts: Conservation of Me- chanical Energy U i = U f + K f + W . (1) since v i = 0 m/s....
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This note was uploaded on 02/20/2011 for the course PHYS 1062 taught by Professor Mackie during the Spring '11 term at Temple.

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CW8 - boland (kbb544) CW8 mackie (10611) 1 This print-out...

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