part a,b,c,d,e, and f Exercise 6.7 Constants Part A Two blocks are connected by

Question

part a,b,c,d,e, and f

Exercise 6.7 Constants Part A Two blocks are connected by a very light string passing over a massless and frictionless pulley (the figure (Figure 1) Traveling at constant speed, the 20.0-N block moves 77.0 cm to the right and the 120-N block moves 77.0 cm downward During this process, how much work is done on the 12.0-N block by gravity? Submit Request Answer Part B Figure During this process, how much work is done on the 12.0-N block by the tension in the s 1 of 1 20.0m Submit Request Answer 12.0 Part C During this process, how much work is done on the 20 0-N block by gravity? Type here to search

Explanation / Answer

A)

work = force * distance

work = 12N x 0.77m

work = 9.24 J

B)

work = -12N x 0.77 = -9.24 J

C)

zero, because the displacement of the block is perpendicular to the force

D)

Work = 12N x 0.77 = 9.24 J

E)

forces are balanced, so the friction force must be -12N

work done by friction = -12 x 0.72 = -9.24 J

F)

zero, because normal force is perpendicular to displacement

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