Question: As shown in the figure below, electric current from the photovoltaic (PV) cells runs an electric motor. The shaft of the motor turns the paddle

As shown in the figure below, electric current from the photovoltaic (PV) cells runs an electric motor. The shaft of the motor turns the paddle wheel inside the water tank. Identify the interactions (mass, heat, work) for the following systems:
(a) PV cells.
(b) Motor.
(c) Tank.
(d) The combined system that includes all these three subsystems.

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