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Question on mechanics?

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  • 16-07-2009 7:42pm
    #1
    Tones66
    Registered Users Posts: 49 ✭


    Hi. I couldn't do this question. If anyone fancies themselves could you post your solution.Any help will be appreciated. I'm stuck. Thanks.

    An unplanned impact has occurred between vehicle A and a stationary vehicle B. Markings on the road indicate that after the impact B slid a distance of 2m before coming to rest. The coefficient of kinetic friction between B's tyres and the road is 0.7 and laboratory tests indicate that a coefficient of restitution e=0.4 is appropriate for this type of impact. Mass vehicle A = 1100kg. Mass vehicle B = 1300kg.

    (a) Assuming that only single impact occurred, determine whether vehicle A was exceeding the relevant speed limit of 30 km/h before the impact.(15 marks)

    (b) Determine the change in momentum for vehicle B. I the duration of the impact is estimated to be 0.01 s,estimate the average force exerted on B by A during impact.(5 marks)

    (c)Determine the percentage of mechanical energy lost in the impact and briefly discuss possible explanations for the energy loss.(5 marks)


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    #2
    Professor_Fink
    Registered Users Posts: 861 ✭✭✭Professor_Fink


    Yes, I could do this for you but I won't. Why don't you tell us where you run into difficulty? Then I would be happy to give you pointers, but you won't learn anything if I simply do it for you.


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