Chapter 29, Problem 71GP

CE Predict/Explain Consider two apple pies that are identical in every respect, except that pie 1 is piping hot and pie 2 is at room temperature, (a) If identical forces are applied to the two pies, is the acceleration of pie 1 greater than, less than, or equal to the acceleration of pie 2? (b) Choose the best explanation from among the following:

• I.                    The acceleration of pie 1 is greater because the fact that it is hot means it has the greater energy.
• II.                 The fact that pie 1 is hot means it behaves as if it has more mass than pie 2, and therefore it has a smaller acceleration.

III The pies have the same acceleration regardless of their temperature because they have identical rest masses.