# ass8 - Practice Problems 8 1 A 13.6 kg block is dragged...

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Practice Problems 8 1 . A 13.6 kg block is dragged over a rough, horizontal surface by a 73.2 N force acting at 16.6 degrees above the horizontal. The block is displaced 4.66 m, and the coefficient of kinetic friction is 0.272. Find the work done by the 73.2 N force. Answer: 3.27e+02 J 2 . Find the work done by the normal force. Answer: 0 J 3 . What work does the gravitational force do on the block? Answer: 0 J 4 . How much energy is lost due to friction? Answer: 1.43e+02 J 5 . [1 point, 10 tries] Find the total change in the block's kinetic energy. Answer: 1.84e+02 J 6 . Calculate the scalar product of the vectors in the figure below. Assume θ 1 = 109°, θ 2 = 130°, F = 37.2 N and v = 18.1 cm/s. Answer: 5.77E+00 W 7 . A force F = (4.41 x i + 2.85 y j ) N acts on an object as it moves in the x direction from the origin to x = 4.53 m. Calculate the work done on the object by the force. Answer: 4.52E+01 J

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8 . When a 4.43 kg mass is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.91 cm. If the 4.43 kg mass is removed how far will the spring
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## This note was uploaded on 12/12/2011 for the course PHYSICS 1D03 taught by Professor N. mckay during the Spring '08 term at McMaster University.

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ass8 - Practice Problems 8 1 A 13.6 kg block is dragged...

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