Final answer:
The term used to define the available power delivered at the propeller shaft is propulsive power, which is responsible for moving the ship forward.
Step-by-step explanation:
The term used to define the power available to produce the net power delivered at the propeller shaft is propulsive power.
Propulsive power is the power that drives the propeller system and is responsible for moving the ship forward. In the context of a ship powered by a nuclear turbine, the rotating turbine shaft transfers power to the propeller, which propels the ship through the water.
Examples of other types of power in physics include electrical power, mechanical power, and thermal power.