- What is the minimum power required for a conveyor to raise an 8.0 N box 4.0 m vertically in 8.0 s ?
- 260 W
- 32 W
- 4.0 W
- 64 W

- Which is a unit of power ?
- joule
- joule/second
- kilogram*meter/second
- newton*meter2/second

- A force of 10. N is required to keep an object moving at a constant speed of 5 m/s. The power used is
- 0.5 W
- 2 W
- 50
- 5 W

- What is the maximum distance that a 60. W motor may vertically lift a 90. N weight in 7.5 s ?
- 2.3 m
- 5.0 m
- 140 m
- 1100 m

- A weightlifter lifts a 2000 N weight a vertical distance of 0.5 m in 0.1 s. What is the power output ?
- 0.0001 W
- 0.0004 W
- 10,000 W
- 40,000 W

- Which term is a unit of power?
- Joule
- Newton
- Watt
- Newton*meter

- As the power of a machine is increased, the time required to move an object a fixed distance
- increases
- decreases
- increases then decreases
- remains the same

- A force of 70 N must be exerted to keep a car moving with a constant speed of 10 m/s. What is the rate at which energy must be supplied ?
- 0.14 W
- 7.0 W
- 700 W
- 7000 W

- A 3.0-kg block is initially at rest on a frictionless, horizontal surface. The block is moved 8.0 m in 2.0 sec by the application of a 12 N horizontal force. What is the average power developed while moving the block?
- 24 W
- 48 W
- 32 W
- 96 W

- A 40.-kilogram student runs up a staircase to a floor that is 5.0 meters higher than her starting point in 7.0 seconds. The student's power output is
- 29 W
- 1.4x10^4 W
- 280 W
- 1.4x10^3 W