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VanKwisH
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Homework Statement
Calculate the mechincal energy convertered to thermal energy when a 8.0kg
box is pushed 5.0 m along a 30 degree cinline at a constant velocity by an
average force of 75 N parallel to the incline.
Hint : how much work is done in pushing the box along the incline?
What is the Gravitational Potential Energy of the box when it is at the top of the incline?
why are these value's not the same?
Homework Equations
Pe1 + Ke1 = Pe2 + Ke2 + Heat
mgh1 + 1/2 mv1^2 = mgh2 + 1/2mv2^2 + (FF* D)
The Attempt at a Solution
the answer is 180 J
I started by calculating the height of the incline which is
H = 5 sin (30) = 2.5m
Pe2 = 8 * 9.8 * 2.5 = 196J
but now i am completely stuck .....
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