(a) In air at 0C, a 1.60-kg copper block at 0C is set

Chapter 20, Problem 76

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(a) In air at 0C, a 1.60-kg copper block at 0C is set sliding at 2.50 m/s over a sheet of ice at 0C. Friction brings the block to rest. Find the mass of the ice that melts. (b) As the block slows down, identify its energy input Q, its change in internal energy DE int, and the change in mechanical energy for the blockice system. (c) For the ice as a system, identify its energy input Q and its change in internal energy DE int. (d) A 1.60-kg block of ice at 0C is set sliding at 2.50 m/s over a sheet of copper at 0C. Friction brings the block to rest. Find the mass of the ice that melts. (e) Evaluate Q and DE int for the block of ice as a system and DE mech for the blockice system. (f) Evaluate Q and DE int for the metal sheet as a system. (g) A thin, 1.60-kg slab of copper at 20C is set sliding at 2.50 m/s over an identical stationary slab at the same temperature. Friction quickly stops the motion. Assuming no energy is transferred to the environment by heat, find the change in temperature of both objects. (h)Evaluate Q and DE int for the sliding slab and DE mech for the two-slab system. (i) Evaluate Q and DE int for the stationary slab.