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20. A 5 kg block of aluminum is heated from 11?C to 99?C at atmospheric pressure....

20. A 5 kg block of aluminum is heated from 11?C to 99?C at atmospheric pressure. Assume the density of aluminum is 2700 kg/m3 and the thermal coefficient of expansion is 2.4 × 10?5 ( ?C)?1 .

a. Find the work done by the aluminum. Answer in units of J.

b. Find the amount of energy transferred to it by heat. Assume the specific heat of aluminum is 900 J/kg · ? C. Answer in units of J.

c. Find the increase in its internal energy. Answer in units of J.

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