1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Estimate the power required to operate the tow

  1. Sep 4, 2007 #1
    1. The problem statement, all variables and given/known data
    A ski tow is operated on a 20 degree slope of lenth 300m. The rope moves at 12.0km/h, and power is provided for 70 riders at one time with an average mass per rider of 65kg. Estimate the power required to operate the tow.


    2. Relevant equations
    P = Work / t
    P = F * v


    3. The attempt at a solution
    60kg * 70 riders = 4550kg
    Solving for time:
    V = 12km/h = 3.33m/s

    t = d / V
    = 300m / 3.33m/s
    = 90.09s

    P = (F * d) / t
    P = ((4550kg)(9.8m/s^2)( 300m))/(90.09s)
    = 148484.8485 watts

    I dont see what is the angle used for
    maybe for another component of force? or is it no use?
     
    Last edited: Sep 4, 2007
  2. jcsd
  3. Sep 4, 2007 #2

    learningphysics

    User Avatar
    Homework Helper

    You need the acceleration along the slope to be zero to keep the riders moving at a constant velocity along the slope... The ski tow exerts a force along the slope.

    Also, you can directly use F*v for power, instead of using time and distance...
     
  4. Sep 4, 2007 #3
    0 = F - wsin(theta)
    F = (4550kg)(9.8m/s^2)sin(20) << so force

    thanks
     
  5. Sep 5, 2007 #4

    learningphysics

    User Avatar
    Homework Helper

    yup. then using this force F*v gives power.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Estimate the power required to operate the tow
  1. Power required (Replies: 2)

  2. Required power. (Replies: 5)

Loading...