Question

1. the rate at which work is done is _____.

a. efficiency
b. effort time
c. power
d. force

Explanation:

To solve this, we recall the definitions:

• Efficiency: Ratio of useful work to total work, not the rate of work.
• Effort time: Time spent, not a rate of work.
• Power: Defined as the rate at which work is done (\( P = \frac{W}{t} \), where \( W \) is work and \( t \) is time).
• Force: A push/pull, related to work (\( W = Fd \)) but not its rate.

Thus, power is the rate of doing work.

Answer:

C. power