WorksheetsWork & Power
Total questions: 20
Worksheet time: 13mins
In which case is work being done?
A
B
C
D
What is the work done on a 0.90 kg model airplane moves at a constant speed of 19 m/s on a circle that is 1 m off the ground?
8.82 J
162 J
8.82 J
0 J
Joel and Jerry push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do on the car.
Joel does 75% more work than Jerry.
Joel does 50% more work than Jerry.
Jerry does 50% more work than Joel.
Joel does 25% more work than Jerry.
Neither of them does any work.
ln the Empire State Building Run-Up, competitors race up the 1576 steps (86 flights) of the Empire State Building, climbing a total vertical distance of 320 m. How much work does a m 74 kg racer do?
2.321 × 105 Joules
2.326 × 105 Joules
2.318 × 105 Joules
2.317 × 105 Joules
If a 74 kg racer took 798 s to climb the 320 m, how power did she developed?
291 Watts
281 Watts
317 Watts
313 Watts
This weight lifter raised 105 kg to a height of approximately 2.31 m in 9 seconds. How much power did he developed?
264 Watts
1029 Watts
2,377 Watts
4,009 Watts
Three cars (car F, car G, and car H) are moving with the same speed and slam on their brakes. The most massive car is car F, and the least massive is car H. If the tires of all three cars have identical coefficients of kinetic friction with the road surface, which car travels the longest distance to skid to a stop?
They all travel the same distance in stopping.
Car F
Car G
Car H
A construction worker uses a pulley and a rope to raise an 85 kg person to a height of 2 m in 6 s. How much did he do?
1,670 J
833 J
278 J
417 J
A construction worker uses a pulley and a rope to raise an 85 kg person to a height of 2 m in 6 s. How much power is he supplying?
1,670 W
833 W
278 W
417 W
Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will do the most work?
Bro A
Bro B
They both will do the same work
Can't tell without knowing the weight they are lifting
Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will supply the most power?
Bro A
Bro B
They both will do the same work
Can't tell without knowing the weight they are lifting
Two movers applied a total force of 350 N to push chest up a ramp into a truck. If the work that they did 1,400 J, calculate the height of the ramp?
4 m
3 m
2 m
1 m
The same force F pushes in three different ways on a box moving with a velocity v, as the drawings show. Rank the work done by the force F in ascending order (smallest first):
A, B, C
A, C, B
B, A, C
C, B, A
C, A, B
A person and an elevator are lifted at a constant velocity for by a cable to a height of 35 m and does 412,000 J of work in the process. What is the tension in the cable?
11,800 N
12,000 N
42,000 N
9,800 N
750 J of work is done on a car jack to raise a car by 0.15 m. Calculate the upward exerted on the car.
5,000 N
113 N
50 N
11,300 N
If this person supplies 81.2 W of power and does 637 J of work to do 5 reps, how much time does he take to do 5 reps?
7.8 s
8.0 s
9.0 s
5.8 s
A motor produces 500.0 W of power in 15 s. How
much work is done?
7,500 J
33 J
765 J
8,000 J
What is the maximum mass a crane can lift to a height of 10.5 m in 120 s, if the crane’s motor produces 3,500 W of power?
4,080 kg
2,700 kg
3,123 kg
3,000 kg
If he weighs 700 N and climbs at a constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the him to overcome gravity is most nearly
1.1 Watts
87.5 Watts
560 Watts
875 Watts
5,600 Watts
Units of Power include which of the following?
I. Watt
II. Joule per second
III. Kilowatt-hour
I only
III only
I and II only
II and III only
I, II, and III
