Work and Power

A 15kg mass is lifted upward at a constant speed to a height of 22m. Calculate the work done by the lifting force.

• 330 W

• 3300 W

• 330 J

• 3300 J

How much work does a 100 Watt motor perform in 5 minutes? (Hint: convert time to SECONDS)

• 20 W

• 500 J

• 30,000 J

• 300 J

A student who weighs 600N climbed the stairs from the second floor to the fourth floor, 20 meters above, in 60 seconds. How much work did she do?

• 12,000 J

• 1,200 W

• 200 J

• 200 W

A student who weighs 600N climbed the stairs from the second floor to the fourth floor, 20 meters above, in 60 seconds. How much power did she have?

• 12,000 J

• 1,200 W

• 200 J

• 200 W

A small motor does 4000J of work in 1 MINUTE. What is the power of the motor in watts?

• 4000 W

• 67 W

• 40,000 J

• 667 J

A 100N load is lifted to a height of 5 m in 30 seconds. Calculate the power.

• 17 W

• 500 W

• 600 W

• 15,000 W

If 2 Joules of work is done in lifting an apple that is 180 GRAMS, how far was it lifted?

(Hint: convert mass to a FORCE, then solve for DISTANCE)

• 0.9m

• 0.36m

• 90m

• 1.1m

A new conveyor system at the local packaging factory will utilize a motor-powered mechanical arm to exert an average force of 890 N to push large crates a distance of 12 meters in only 22 seconds. Determine the power output required of such a motor.

• 485 W

• 49 W

• 1632 W

• 0.3 W

A woman runs a kilometer using a force of 210N and a power output of 500W. How long does it take this woman to complete 1 kilometer?

• 0.42sec

• 42 sec

• 420 sec

• 4,200 sec