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March 29, 2017

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The pendulum bobs in the figure are made of soft clay so that they stick together after impact. The mass of bob B is 14 times that of bob A. Bob B is initially at rest. If bob A is released from a height h above its lowest point, what is the maximum height attained by bobs A and B after the collision?


I also don't have any clue about this one! Please help, thanks.

  • Physics - ,

    Here's two or three clues.

    For the velocity of A just before impact (Va), use conservation of energy.

    g*h = (1/2)*Va^2

    For the velocity of and b stuck together after impact (Vfinal) , use conservation of momentum. (It is not an elastic collision)
    Ma*Va = Vfinal*(Ma + Mb)
    = 15*Ma*Vfinal

    Once you get Vfinal, use conservation of energy again to get the height that they rise together.

  • Physics - ,

    Thanks!

  • Physics - ,

    Thank you Drwls :)

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