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Vanyuwa [196]
3 years ago
9

How much power does a hair dryer require to transform 198 000 J of energy in 15 mins?

Physics
1 answer:
Marina86 [1]3 years ago
7 0

(198,000 joule / 15 minute) x (minute / 60 sec) = 220 joule/sec = <em>220 watts


</em>
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Complete Question:

A child pushes horizontally on a box of mass m which moves with constant speed across a horizontal floor. The coefficient of friction between the box and floor is u. At what rate does the child do work on the box? g= gravity

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1. μ*m*g*v

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As the box is moving at constant speed, in the horizontal plane, we have two forces present, that must  be equal and opposite each other so the net horizontal force be zero: the force that the child does and the friction force.

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