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!

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



    3.
     
  2. jcsd
  3. Mar 15, 2009 #2

    LowlyPion

    User Avatar
    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? ...
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook