Question: An external force drags and accelerates a rigid body over a surface. Treating the body as a thermodynamic system, determine the sign (positive: 1; negative:

An external force drags and accelerates a rigid body over a surface. Treating the body as a thermodynamic system, determine the sign (positive: 1; negative: -1; none: 0) of
(a) Wext
(b) Q across its boundary. Assume friction to be present.

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