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1. A 2.7-kg copper block is given an initial speed of 4.0 m/s on a rough...

1. A 2.7-kg copper block is given an initial speed of 4.0 m/s on a rough horizontal surface. Because of friction, the block finally comes to rest.

(a) If the block absorbs 85% of its initial kinetic energy as internal energy, calculate its increase in temperature.

(b) What happens to the remaining energy?

2. A certain steel railroad rail is 13 yd in length and weighs 80.0 lb/yd. How much thermal energy is required to increase the length of such a rail by 3.0 mm? Note: Assume the steel has the same specific heat as iron.

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