problem06_80

University Physics with Modern Physics with Mastering Physics (11th Edition)

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6.80: The students do positive work, and the force that they exert makes an angle of ° 0 . 30 with the direction of motion. Gravity does negative work, and is at an angle of ° 0 . 60 with the chair’s motion, so the total work done is J 8 . 257 ) m 50 . 2 )( 0 . 60 cos ) s / m 80 . 9 )( kg 0 . 85 ( 0 . 30 cos ) N 600 (( 2 tot = ° - ° =
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Unformatted text preview: W , and so the speed at the top of the ramp is . s / m 17 . 3 ) kg . 85 ( ) J 8 . 257 ( 2 s) / m 00 . 2 ( 2 2 tot 2 1 2 = + = + = m W v v Note that extra figures were kept in the intermediate calculation to avoid roundoff error....
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This document was uploaded on 02/04/2008.

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