A student carries her backpack up two flights of stairs to class. Is the student doing work?
Yes
No
A student picks her backpack up 2 meters off the ground and places it on her shoulders. Is the student doing work?
Yes
No
A crane applies a force of 87,250 N to lift a boulder a distance of 25.0 meters. How much work did the crane do?
0.00028 J
3490 J
81,250 J
2,181,250 J
You lift a 50-newton bag of mulch and do 125 joules of work. How far did you lift the bag of mulch?
0.4 m
2.5 m
52 m
6,250 m
A bulldozer does 56,750 J of work over 18 minutes. How much power does the bulldozer have? Hint: Convert minutes to seconds
53 W
3152 W
103,500 W
61,290,000 W
If a small machine uses a force of 785 N on an object to move it a distance of 100 meters in 20 seconds. What is the power of the machine doing the work?