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Homework Help: I need help with this i am lost

  1. Mar 15, 2009 #1
    1.Sand from a stationary hopper falls on a mov-
    ing conveyor belt at the rate of 4 kg/s, as
    shown in the figure. The belt is supported by
    frictionless rollers and moves at 1.07 m/s un-
    der the action of a horizontal external force
    supplied by the motor that drives the belt.
    Find the sand’s rate of change of momen-
    tum in the horizontal direction. Answer in
    units of N.

    2. i know the rate of change of momentum is equal to the force but i need help figuring out that i really just need help getting started

  2. jcsd
  3. Mar 15, 2009 #2


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    Homework Helper

    Welcome to PF.

    Well what is the change in momentum?

    Momentum after - momentum before? I can't see your picture, but I suppose it falls vertically. So the final speed in X is what? The initial speed in X is what and what is the rate of sand mass in 1 sec? ...
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