problem06_52

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

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6.52: Here, Eq. (6.19) is the most direct. Gravity is doing negative work, so the rope must do positive work to lift the skiers. The force F is gravity, and , Nmg F = where N is the number of skiers on the rope. The power is then W. 10 96 . 2 ) 0 . 15 (90.0 cos h km 6 . 3 s m 1 h) km (12.0 ) s m (9.80 kg) (70 ) 50 ( cos ) ( ) ( 4 2 × = ° - °
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Unformatted text preview: = = φ v Nmg P Note that Eq. (1.18) uses as the angle between the force and velocity vectors; in this case, the force is vertical, but the angle ° . 15 is measured from the horizontal, so °-° = . 15 . 90 is used....
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• Force, Mass, Velocity vectors, negative work, W. Note, km h cos

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