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By Joseph | October 3, 2009
3 Physics Problem help..!10pts for showing work and solve?
1)A hill is 100m long and makes an angle of 12 degree with the horizontal. As a 50kg jogger runs up the hill, how much work does the jogger do again gravity?
2) A 40N crate starting at rest slides down a rough 6m long ramp inclined at 30 degree with the horizontal. The force of friction between the crate and ramp is 6.0N. Using the work kinetic energy tho rem, find the velocity at the bottom of the incline.
3) A 16kg child on roller skates, initially at rest, rolls 2.0m down an incline at an angle of 20. degree with the horizontal. If there is no friction between incline and skates, what is the kinetic energy of the child at the bottom of the incline?
Um heres the formulas..I tried to do them x_x
-W=FDcos(degree)
-KE=1/2mv^2
1. Find height of hill.
sin 12 = h / 100
h = 20.79116908m
W = Eg2 – Eg1
Assume Eg1 is 0 if he starts at rest.
Assume he runs at a constant speed.
Therefore W = Eg2
Eg2=mgh
= 50kg*9.81m/s^2*20.79116908m
= 10198.06843 J
3. OK, YOU CAN’T ROLL DOWN AN INCLINE.
Beach Boys – Roller skating child live 1978
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