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A 21.1 g block of copper whose temperature is 324 K is placed in an insulating...

A 21.1 g block of copper whose temperature is 324 K is placed in an insulating box with a 111 g block of lead whose temperature is 198 K. (a) What is the equilibrium temperature of the two-block system? (b) What is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c)What is the change in the entropy of the two-block system? The heat capacities of copper and lead are 386 J/kg·K and 128 J/kg·K, respectively.

a.number? unit?

b.number? unit?

c.number? unit?

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