Problems with Work and Kinetic Energy

AI Thread Summary
The discussion revolves around a physics problem involving a skier being pulled up a frictionless slope by a tow rope. The key points include the skier's movement at constant speeds of 1.0 m/s and 2.0 m/s, with a specified work done by the rope of 950 J over a distance of 8.0 m. Participants express confusion about how to approach the problem, particularly regarding the work-kinetic energy theorem and the lack of necessary information, such as the skier's mass. Suggestions for resources to better understand the concepts are provided, emphasizing the importance of diagrams and equations in solving the problem. Overall, the thread highlights common challenges faced by students in applying physics principles to real-world scenarios.
chippercheeta
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Hey, I have been fiddling with with problem all day today and I really have no idea how to even approach it. I was wondering if anyone could help shed some light onto it for me. Any help would be greatly appreciated!

[HRW7 7.P.042.] A skier pulled by a tow rope up a frictionless ski slope that makes an angle of 12° with the horizontal. The rope moves parrallel to the slope with a constant speed of 1.0 m/s. The force of the rope does 950 J of work on the skier as the skier moves a distance of 8.0 m up the incline.

(a) If the rope moved with a constant speed of 2.0 m/s, how much work would the force of the rope do on the skier as the skier moved a distance of 8.0 m up the incline?
___________J
(b) At what rate is the force of the rope doing work on the skier when the rope moves with a speed of 1.0 m/s?
__________W
(c) At what rate is the force of the rope doing work on the skier when the rope moves with a speed of 2.0 m/s?
________W


Thanks so much!

-Ashley
 
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What have you done?

Do you know?

\sum_{i=1}^{n} W_{i} = \Delta K
 
well I am not very good at physics (at all)

Im not familiar with that equation I don't think we covered that in our class.

I have no idea how to read the problem even to begin to answer it. It all makes no sense and the book my teacher uses is useless... I tried drawing out a diagram and I have tried the force=mgsin(theta) but I don't have the mass to find that and that's pretty much the only thing I know to try to do.
 

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