How much energy would be required to increase the temperature 9kg of aluminium (specific heat capacity = 899J/kg°C) by 64°C?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.