Question

In: Physics

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

  1. 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

  2. Add up the y-components, ΣFy, and determine the normal force the floor exerts upward on the block.

    a.

    588 N
    b.

    345 N
    c.

    279 N
    d.

    126 N

  3. 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.

  1. a.

    345.2 J
    b.

    -705.6 J
    c.

    -980.1 J
    d.

    1257.9 J

  2. Add up the x-components, ΣFx , 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

Solutions

Expert Solution

genius_generous answered 1 year ago
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