A 11.0 kg box is pulled by a horizontal wire in a circle on a rough horizontal surface for which the coefficient of kinetic friction is 0.300.
(a) Calculate the work done by friction during one complete circular trip if the radius is 2.00 m.
(b) Calculate the work done by friction during one complete circular trip if the radius is 4.00 m.
(c) On the basis of the results you just obtained, would you say that friction is a conservative or nonconservative force?
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