Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    This question is given on the M2 Mock 2000 Paper. Solution of whole paper would be nice but if not, could you answer this q?

    1) A Smooth sphere is moving with speed 'U' in a straight line on a smooth horizontal plane. It strikes a fixed smooth vertical wall at right angles. The coefficient of restitution between the sphere and the wall in 0.5.

    Find the fraction of the Kinetic Energy of the sphere that is lost as a result of the impact.

    (5 Marks)

    Please help!
    Offline

    2
    ReputationRep:
    it will rebound off the wall with velocity: -eu = -u/2

    initial K.E. = (1/2)mU^2

    final K.E. = (1/2)m(-U/2)^2 = (1/8)mU^2

    K.E. lost = (mU^2/2) - (mU^2/8) = (mU^2)/4

    fraction of K.E. lost = (mU^2/4) / (mU^2/2) = (1/4) / (1/2) = 1/2
 
 
 

University open days

  1. University of Cambridge
    Christ's College Undergraduate
    Wed, 26 Sep '18
  2. Norwich University of the Arts
    Undergraduate Open Days Undergraduate
    Fri, 28 Sep '18
  3. Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 29 Sep '18
Poll
Which accompaniment is best?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.