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Question :
1. The unit of work, joule, dimensionally the same as:
A. : 2102106

1. The unit of work, joule, is dimensionally the same as:

A. newton/second.

B. newton/kilogram.

C. newton-second.

D. newton-meter.

2. Rupel pushes a box 5.00 m by applying a 25.0-N horizontal force. What work does she do?

A. 10.0 J

B. 25.0 J

C. 125 J

D. 550 J

3. A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?

A. 240 J

B. 216 J

C. 144 J

D. 96 J

4. A horizontal force of 100 N is applied to move a 45-kg cart across a 9.0-m level surface. What work is done by the 100-N force?

A. 405 J

B. 500 J

C. 900 J

D. 4 500 J

5. I use a rope 2.00 m long to swing a 10.0-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight?

A. 40.0 J

B. 126 J

C. 251 J

D. 0