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    How do you do ranges for coefficient of restitution? i know you have to work it out by doing inequalities but how? here is an example for june 2001 paper.

    a particle A of mass 2m is moving with speed 2u on a smooth horizontal table. the particle collides directly with a particle B of mass 4m moving with speed u in the same diresction as A. the coefficient of restitution between A and B is 1/2.

    (a)show that the speed of B after the collision is 3/2u.(i have done this part)

    (b)Find the speed of A after the collision.(i have done this as well,answer=u)

    Subsequently B collides directly with a particle C of mass m which is at rest on the table. the coefficient of restitution between B and C is e. Given that there is no further collisions,

    (c)Find the range of possible values for e.(the answer is e is less than or the same as 2/3)

    please can some one help
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    0 <= e <= 1

    So, use e=1 to get the maximum, and e=0 to get the minimum. This method doesn't always work, btw.
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    (Original post by foreverblue)
    Subsequently B collides directly with a particle C of mass m which is at rest on the table. the coefficient of restitution between B and C is e. Given that there is no further collisions,

    (c)Find the range of possible values for e.(the answer is e is less than or the same as 2/3)

    please can some one help
    well, for no other collisions, C > B > A

    (think about it for a sec)

    so do something do with that.

    i always think i know what im doing but htne they do something else though, so it may not be right.
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    (Original post by foreverblue)
    How do you do ranges for coefficient of restitution? i know you have to work it out by doing inequalities but how? here is an example for june 2001 paper.

    a particle A of mass 2m is moving with speed 2u on a smooth horizontal table. the particle collides directly with a particle B of mass 4m moving with speed u in the same diresction as A. the coefficient of restitution between A and B is 1/2.

    (a)show that the speed of B after the collision is 3/2u.(i have done this part)

    (b)Find the speed of A after the collision.(i have done this as well,answer=u)

    Subsequently B collides directly with a particle C of mass m which is at rest on the table. the coefficient of restitution between B and C is e. Given that there is no further collisions,

    (c)Find the range of possible values for e.(the answer is e is less than or the same as 2/3)

    please can some one help
    how any marks are there for c?
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    (Original post by SasunD)
    how any marks are there for c?
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    (Original post by foreverblue)
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    i see, so you will have to do another restitution and momentum equating equations for B and C to work out the values of e.

    im working on it at the moment, so ill post the answer in a couple of mins.
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    its not working, ill get a fresh pad of paper to do some more wokring out.
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    This question was up last week here http://www.uk-learning.net/t48510.html
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    thanks Bezza, i was trying to use B and C, but it wasn't working.
 
 
 
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