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Power needed to keep conveyor belt moving at constant speed

  1. Nov 2, 2015 #1
    1. The problem statement, all variables and given/known
    image.jpg


    2. Relevant equations
    P=Fv
    K.E = 1/2 mv2
    3. The attempt at a solution
    This is the examiner report:
    Why infinte acceleration? Is it because the mass is too small?
     
    Last edited: Nov 2, 2015
  2. jcsd
  3. Nov 2, 2015 #2

    gneill

    User Avatar

    Staff: Mentor

    It is assuming that every grain of sand (each of which has a non-zero mass) immediately goes from rest to v without passing through any intermediate speeds. This would require an instantaneous velocity change of a mass by a finite amount, which would be breaking (or at best ignoring) the actual laws of physics.
     
  4. Nov 2, 2015 #3
    Oh I see, thanks very much
     
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