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vampirchik [111]

3 years ago

14

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of f

riction between the box and the floor is Î¼. At what rate does the child do work on the box?

1 answer:

dexar [7]3 years ago

4 0

Answer:

Explanation:

Given

mass of box is m

speed of box is v

coefficient of friction $\mu =\frac{1}{4}=0.25$

Box is moving at a constant speed i.e. Net Force on box is zero

i.e. Frictional Force and Force Applied are Equal

$F=f_r=\mu mg$

The Rate at which power is generated is

$P=F\cdot v$

$P=\mu mg\cdot v$

$P=0.25mgv$

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