Homework help! When Push Comes to Shove Part A Two forces, of magnitudes Fi = 10

Question

Homework help!

When Push Comes to Shove Part A Two forces, of magnitudes Fi = 100 N and F2 = 30.0 N Find the work Wi done on the block by the force of magnitude F1-100 N as the block moves from zi =-5.00 cm to zf-6.00 cm act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. (Figure 1) Initially, the center of the block is at position 5.00 cm. At some later time, the block has moved to the right, and its center is at a new position, Tf6.00 cm Express your answer numerically, in joules. Hints Submit My Answers Give Up Part B Find the work W 2 done by the force of magnitude F2 = 30.0 N as the block moves from zi =-5.00 cm to zf-6.00 cm Express your answer numerically, in joules. Figure 1 Hints Submit My Answers Give Up +x x=xi Part C What is the net work Wnet done on the block by the two forces? Express your answer numerically, in joules.

Explanation / Answer

Given:

F1 = 100 N

F2 = 30 N

xi = -5 cm = -0.05 m

xf = 6 cm = 0.06 m

x travelled = |-0.05-0.06| = 0.11 m

Part a:

Work done = F*d

W1 = 100*(0.11)

W1 = 11 J

Part b:

W2 = -30*(0.11)

W2= -3.3 J

Part c:
Wnet = 70*(0.11) = 7.7 J

Part d:

Kf - Ki = Wnet

Kf - Ki = 7.7 J

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