Thermal energy of a substance is determined by the movement of the molecules and the potential energy of the arrangement of molecules. heat transfer will stop when thermal equilibrium is reached. it depends upon the substance how long that takes.

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.