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!

Power required by escalator

  1. Apr 6, 2016 #1
    1. The problem statement, all variables and given/known data
    esc.png

    2. Relevant equations
    W=Fx*d
    P=W/Δt

    3. The attempt at a solution
    Shot in the dark but, 20 people with 60 kg mass=1200kg total mass. Weight=1200kg*9.8m/s^2=11760N. Force component along the incline is 11760N*sin(30)=5880N. Work=5880N* 10m=58800J.(The 10m was found from trig function of the angle 30). Power=58800J/60sec=980W.

    Answer is 980 watts?
     
  2. jcsd
  3. Apr 6, 2016 #2

    gneill

    User Avatar

    Staff: Mentor

    Hi Le_Anthony. You're solution looks fine.

    You could also have gone with a conservation of energy approach, finding the change in gravitational potential energy for the 20 people being raised 5 m, thus skipping the force calculations.
     
  4. Apr 7, 2016 #3
    Ahhhh i see. That saves a lot of time actually. I will do that on my test this friday. Thanks!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Power required by escalator
  1. Power required (Replies: 2)

  2. Required power. (Replies: 5)

Loading...