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Q. 37

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 229

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Short Answer

a. How much work must you do to push a kg block of steel across a steel table at a steady speed of m/s for s?

b. What is your power output while doing so?

a). work done is J

b). power output is W

See the step by step solution

Step by Step Solution

Step 1. Part a). Find the work done

Work done on block is , where we don't know (yet) force or displacement. If we look at force on block, we see that there are two on block: friction and force of push. We can use second law of Newton

Displacement with velocity and elapsed time

So, work required to push the block is

Step 2. Part b). Power Output

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