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

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6.53: a) In terms of the acceleration a and the time t since the force was applied, the speed is at v = and the force is ma , so the power is . ) ( ) ( 2 t ma at ma Fv P = = = b) The power at a given time is proportional to the square of the acceleration, tripling the acceleration would mean increasing the power by a factor of nine. c) If the magnitude of
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Unformatted text preview: the net force is the same, the acceleration will be the same, and the needed power is proportional to the time. At s . 15 = t , the needed power is three times that at 5.0 s, or 108 W....
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This document was uploaded on 02/04/2008.

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