Final answer:
Power is the rate at which work is done or energy is transferred. The correct formula for power in a straight line motion is 'Force x velocity'. For rotational motion, power is calculated as 'Torque x angular velocity'. option (B)
Step-by-step explanation:
The definition of power in physics is the rate at which work is done or energy is transferred. To calculate power in terms of forces and motion in a straight line, it is equal to the force multiplied by the velocity at which the object is moving. Therefore, the correct formula for power, given the options, is C. Force x velocity.
When considering rotational motion, power is the product of torque and angular velocity. This is represented by the equation P = Tw, where 'T' is the torque and 'ω' (omega) is the angular velocity. Hence, option D, Torque x time, is not accurate for the definition of power.