problem06_99

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

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6.99: a) N. 358 km/h)) m/s)/(3.6 km/h)((1 0 . 60 ( W/hp) hp)(746 00 . 8 ( = b) The extra power needed is hp, 2 . 39 kW 3 . 29 )) 10 / 1 ( sin(arctan 3.6 km/h 6 . 60 ) m/s kg)(9.80 1800 ( m/s km/h 2 || = = = mgv so the total power is 47.2 hp. (Note: If the sine of the angle is approximated by the tangent, the third place will be different.) c) Similarly, hp, 94 . 3 kW 94 . 2 )) 010 . 0 ( sin(arctan 3.6 km/h 0 . 60 ) m/s kg)(9.80 1800 ( m/s km/h 2 || = = = mgv This is the rate at which work is done on the car by gravity. The engine must do work on
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Unformatted text preview: the car at a rate of 4.06 hp. d) In this case, approximating the sine of the slope by the tangent is appropriate, and the grade is , 0203 . km/h)) m/s)/(3.6 km/h)((1 . 60 )( m/s kg)(9.80 1800 ( W/hp) hp)(746 00 . 8 ( 2 = very close to a 2% grade....
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## This document was uploaded on 02/04/2008.

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