Unformatted text preview: The change in thermal energy of the blockfloor system is equal to the work done by the friction between the block and floor. We get ∆ E th = W f = μ k mgd = 23.52 J The thermal energy goes to the floor, or to the block. Hence the change in thermal energy of the floor is ∆ E th = ∆ E th,B + ∆ E th,F ⇒ ∆ E th,B = ∆ E th  ∆ E th,F = 8.52 J b) During the displacement of 2.00 m, what is the increase in the kinetic energy of the block? According to the workenergy theorem, change in the kinetic energy of an object is equal to the work done by the net force exerted on the object. Only the applied horizontal force and friction do work on the block. The workenergy theorem yields ∆ K = W net = W F + W f = Fd  μ k mgd = 76.5 J...
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 Spring '08
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 Energy, Force, Mass, Thermal Energy, Tomoyuki Nakayama

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