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Power/Work problem

  1. Apr 13, 2009 #1
    1. The problem statement, all variables and given/known data
    A 13.5 m long conveyor belt, inclined at 30.0°, is used to transport bundles of newspapers from the mailroom up to the cargo bay to be loaded on to delivery trucks. Each newspaper has a mass of 1.0 kg, and there are 26 newspapers per bundle. Determine the power that the conveyor develops if it delivers 15 bundles per minute.

    2. Relevant equations
    w = fd
    w = fdcos(theta)
    P = w/t

    3. The attempt at a solution
    I've tried several things getting incorrect answers of:
    57.33
    859.95
    744.74
    49.6
    372.4
     
  2. jcsd
  3. Apr 14, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    Welcome to PF.

    Maybe focus on your last equation? If you figure the work performed in 1 minute you're just about home free right?

    So what is the work of moving 1 newspaper to the top of the ramp?

    W = ΔPE = m*g*Δh

    where Δh = 13.8*sin30 = 1/2*13.8 = 7.9 m

    Figure then the total work from 15*26 newspapers and that tells you how much for a minute, so getting to work/sec is really easy then.
     
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