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cruisx
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Homework Statement
Hey guys, just wondering if you guys could help me out a bit.
A boy on a sled with a total mass of 72kg slides from rest down a hill, which is 35m high. The friction force between sled and snow has a magnitude of 250N. If the slope of the hill makes an angle of 37 degrees with the horizontal, find:
a) the gravitational potential energy of the sled at the top of the hill relative to the base.
Homework Equations
If i am not mistaken the equation for Gav.pot energy is
U= GMe * m
...Re2
and the value of g can be found as g = G * Me/ (R + h)2
The Attempt at a Solution
I know i have the following from the question:
m= 72kg
h1=35m
Ff= 250N
now what i don't get is where the 37 degrees is supposed to come in and i am not quite sure that that is the equation that i am supposed to use. Could someone please explain to me how i would begin this question? I want to solve it my slef but can someone point me into a direction. thank you.edit: wait a second, i think i was doing it wrong. Would it be like E1g = mgh = (72kg)(9.8m/s2)(35m) = 24696 J ?
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