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02-27-2008, 06:55 PM
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| Some basic physics problems?
1) The force an ideal spring exerts on an object is given by Fx= - kx, where x measures the displacement of the object from its equilibrium (x= 0) position. If k = 60 N/m, how much work is done by this force as the object moves from x = - 0.20 m to x = 0 ? 2) A 5.0-kg block slides down a surface inclined 30 degrees with the horizontal. If the coefficient of kinetic friction for the block and the surface is equal to 0.25, at what rate is the friction force on the block doing work at an instant when the speed of the block is 3.0 m/s?      |
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