Which statement best describes heat and thermal energy?
they are different words for the same thing.
they represent different concepts.
heat is what happens when thermal energy stops moving between substances.
thermal energy is what happens when heat moves between substances.

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.