# HW 5 - HW 5 1) A 50 kg block is pulled at a constant speed...

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HW 5 1) A 50 kg block is pulled at a constant speed of 6.6 m/s across a horizontal floor by an applied force of 138 N directed 37° above the horizontal. What is the rate at which the force does work on the block? 2) A 0.45 kg mass sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (with k = 425 N/m ) whose other end is fixed. The mass has a kinetic energy of 9.0 J as it passes through its equilibrium position (the point at which the spring force is zero). A. At what rate is the spring doing work on the mass as the mass passes through its equilibrium position? B. At what rate is the spring doing work on the mass when the spring is compressed 0.103 m and the mass is moving away from the equilibrium position?

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3) A 450-g block is dropped onto a vertical spring with spring constant k =180.0 N/m . The block becomes attached to the spring, and the spring compresses 47.9 cm before momentarily stopping. While the spring is being compressed, A. What work is done on the block by its weight? B.
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## This note was uploaded on 10/24/2011 for the course PHYS 211 at USC.

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HW 5 - HW 5 1) A 50 kg block is pulled at a constant speed...

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