75kg roller skater traveling 15 m/s skids to a stop. if all of the energy is absorbed by his .5 kg aluminum skates, what is the change in temperature?

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.