#12 asks for the work done pulling a skier up a hill. W=Frcosθ
F is the force needed to pull the skier up the hill. This part is a force problem. Draw a force diagram. Make a chart of force parallel to the incline, perpendicular to the incline and "?" (idk). Sum the forces parallel to the incline (hint: the skier's velocity is constant) to find the force needed to pull the skier. That's F.
The problem gives you the distance up the incline. That's r.
The angle θ is the angle between the force (pulling up the incline) and the displacement (up the incline). NOT necessarily the angle they give you.
3 comments:
#12 asks for the work done pulling a skier up a hill. W=Frcosθ
F is the force needed to pull the skier up the hill. This part is a force problem. Draw a force diagram. Make a chart of force parallel to the incline, perpendicular to the incline and "?" (idk). Sum the forces parallel to the incline (hint: the skier's velocity is constant) to find the force needed to pull the skier. That's F.
The problem gives you the distance up the incline. That's r.
The angle θ is the angle between the force (pulling up the incline) and the displacement (up the incline). NOT necessarily the angle they give you.
Hope that helps. Good luck.
I am also still confused on 13. I got an answer for 12 but don't know what 13 is asking for or what it's talking about.
Actually, I did the wrong division to find the time. Thank you Doctor.
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