1. Limited time only! Sign up for a free 30min personal 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!

Calculate useful energy output ?

  1. Sep 28, 2011 #1
    I have a problem i am trying to solve, the question is;
    Calculate the velocity ratio for this system. If the work put in is 3000J, calculate the useful energy output.
    The system in question is a Hydraulic lifting frame upon which crates are placed.
    It is lifted with a hydraulic ram which is located between the load and the fulcrum, thus making this system the third order of lever.
    The distance from the load to the effort is 5M and the distance from the effort to the fulcrum is 1M.

    LOAD--------(5M)------I---(1M)---o (pivot)

    I = Hydraulic ram.

    (i apologize for the poor diagram!) Thank you in advance for any help.
  2. jcsd
  3. Oct 2, 2011 #2
    Using Feffort = Fload * dload/deffort and solving for Fload we get Fload = Feffort * de/dl

    and subbing in the distances and applied (effort) force we get
    Fload = 3000J * 1/6 = 500J so you be able to lift masses up to about 50kg
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook