Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Power with work

  1. Nov 1, 2005 #1
    A 650 kg elevator starts from rest. It goes upward for 3 seconds with constant acceleration until it reaches its cruising speed 1.75 m/s. Find average power...

    I'm not really sure where to begin I am basically having trouble finding work for this problem, does anyone know how I should find the work for this?
     
  2. jcsd
  3. Nov 1, 2005 #2

    Pyrrhus

    User Avatar
    Homework Helper

    Start with the definition of acceleration...
     
  4. Nov 1, 2005 #3

    lightgrav

    User Avatar
    Homework Helper

    The effect of Work is Energy transfer ...

    Does the elevator have more Energy, later?
    What kinds of Energy will it have?

    (alternative approach: Force is constant,
    average velocity is easy to determine.)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook