Question

Directions: Solve the following problems. Show the formula, work, and answer with units for full credit.

11) If 68 W of power is produced in 18 seconds, how much work is done?
Formula
Work with Units
Answer with Units
12) If 68 Joules of work were necessary to move a 4 Newton crate, how far was the crate moved?
Formula
Work with Units
Answer with Units
13) If a group of workers can apply a force of 1000 Newtons to move a crate 20 meters, what
amount of work will they have accomplished?
Formula
Work with Units
Answer with Units

Answer 1

11)

Power = work/time

68 watts = work/18 seconds

work = 68 watts x 18 seconds

work = 1,224 Joules

12)

You didn't say how much force is applied to the crate. You only told us the weight of the crate. We'll pull a number out of the air, and say that you're pushing the crate with 4 Newtons of force.

Work = force x distance

68 joules = 4 Newtons x distance

Distance = 68 joules / 4 newtons

Distance = 17 meters

13)

work = force x distance

work = 1000 newtons x 20 meters

work = 20,000 Joules