(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

Pe1 + Ke1 = Pe2 + Ke2 + Heat

mgh1 + 1/2 mv1^2 = mgh2 + 1/2mv2^2 + (FF* D)

3. 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 completly stuck ..............

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# Homework Help: Questions regarding conservation of energy with heat

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