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A 10.0-kg box is palled by a horizontal wire in a circle on a rough horizontal surface

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A 10.0-kg box is palled by a horizontal wire in a circle on a rough horizontal surface for which the coefficient of kinetic friction is 0.250. Calculate the work done by friction during one complete circular trip if the radius is
(a) 2.00 m and
(b) 4.00 m.
(c) On the basis of the results you just obtained, would you say that friction is a conservative or non-conservative force? Explain.
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