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

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7.4: a) The rope makes an angle of ( 29 ° = 30 arcsin m 6.0 m 0 . 3 with the vertical. The needed horizontal force is then N, 679 30 tan ) s m (9.80 kg) 120 ( tan 2 = ° = θ w or N 10 8 . 6 2 × to two figures. b) In moving the bag, the rope does no work, so the worker does an amount of work equal to the change in potential energy,
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Unformatted text preview: J. 10 0.95 ) 30 cos (1 m) (6.0 ) s m (9.80 kg) 120 ( 3 2 × = °-Note that this is not the product of the result of part (a) and the horizontal displacement; the force needed to keep the bag in equilibrium varies as the angle is changed....
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