Two particles A and B are moving as shown in the figure.  &n

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261.

Two particles A and B are moving as shown in the figure.

      

Their total angular momentum about the point O is

  • 9.8 kg m2 / s

  • zero

  • 52.7 kg m2 / s

  • 37.9 kg m2 / s


A.

9.8 kg m2 / s

Total angular momentum about O is given as,

    L = L1 + L2 = m1v1r1 + m2v2r2

       = − 6.5 × 2.2 × 1.5 + 3.1 × 3.6 × 2.8

       = − 21.45 + 31.248 = 9.8 kg m2 / s


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262.

A circular disc rolls on a horizontal floor without slipping and the centre of the disc moves with a uniform velocity v. Which of the following values of the velocity at a point on the rim of the disc can have ? 

  • v

  • − v

  • 2v

  • Zero


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