HW 5: Work and Exercise 1 of 1
POSSIBLE POINTS: 100
A number of students have done some squats for their PE class. Now you are tasked with calculating how much work
they performed while doing the squats. (Warning, MANY assumptions coming into play)
Total Work performed Force' Distance Number of squats
Student weight in Newtons (N)
Half of height in meters (m)
Number of squats
Work performed (J)
500
1.01
19
251
0.88
102
850
0.68
1.721
<
0.99
2
825
326
201
20,000
0.77
77
35,000
1,000
1.15
230,000
I Review

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.