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Chapter 1: Q17DQ (page 194)

Time yourself while running up a flight of steps, and compute the average rate at which you do work against the force of gravity. Explain your answer in watts and in horsepower.

Short Answer

Expert verified

Multiply the last result in watts by 1hp746Wto convert in horsepower.

Step by step solution

01

About work done by the man

The total work done by man is given by:

W = mgh

The work done is expressed in terms of mass m, vertical height h, and g in SI units.

02

Calculation of Average rate or power

The rate at which work is done against the force of gravity is given by,

P=mghtwatts

Where is the taken by man to run up the stairs.

Now, use the following conversion to express the rate in horsepower:

1hp=746W

Thus, multiply the last result in watts by 1hp746W to convert in horsepower.

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