A stonemason is dragging a 60-kg marble block 4 m across a floor by pulling on...

A stonemason is dragging a 60-kg marble block 4 m across a floor by pulling on a rope attached to the block. He pulls with a horizontal force of 210 N. The coefficient of kinetic friction between the block and the floor is 0.30. The next five questions have to do with this scenario. Draw yourself a free-body diagram on the block.

How much work was done by the stonemason in dragging this block?

a.
100 J

b.
560 J

c.
840 J

d.
1230 J
Add up the y-components, ΣF_y, and determine the normal force the floor exerts upward on the block.

a.
588 N

b.
345 N

c.
279 N

d.
126 N
Using your result from above, calculate the kinetic frictional force between the block and the floor.

a.
45.6 N

b.
56.7 N

c.
98.5 N

d.
176.4 N

Determine the work done by friction.

a.
345.2 J

b.
-705.6 J

c.
-980.1 J

d.
1257.9 J
Add up the x-components, ΣF_x , and determine the block's acceleration.

a.
3.7 m/s²

b.
0.91 m/s²

c.
0.56 m/s²

d.
0.38 m/s²

Expert Solution

genius_generous answered 2 years ago

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