A 1kg rock is held in place by against the inside wall of the rotating drum. The radius of the drum is 0.2 meters and the period of the drum is 15. The angular momentum of the rock is

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.