Physics I For Dummies by Steven Holzner
Author:Steven Holzner [Holzner, Stephen]
Language: eng
Format: epub
ISBN: 9781119872245
Publisher: Wiley
Published: 2022-03-12T00:00:00+00:00
Plugging in the numbers gives you
Because the horse does this work in 2.0 seconds, the power needed is
One horsepower is 745.7 watts, so the horse is giving you about one-half horsepower â not too bad for a one-horse open sleigh.
Doing alternate calculations of power
Because work equals force times distance, you can write the equation for power the following way, assuming that the force acts along the direction of travel:
where s is the distance traveled. However, the objectâs speed, v, is just s divided by t, so the equation breaks down to
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