Question

A homogeneous disc of mass 2 kg and radius 15 cm is rotating about its axis (which is fixed) with an angular velocity of 4 radian/s. The linear momentum of the disc is ____________.

Options

• 1.2 kgm/s

• 1.0 kgm/s

• 0.6 kgm/s

• 0.5 kgm/s

Answer 1

A homogeneous disc of mass 2 kg and radius 15 cm is rotating about its axis (which is fixed) with an angular velocity of 4 radian/s. The linear momentum of the disc is 1.2 kgm/s.

Explanation:

` "v" = "r"omega = 0.15 xx 4 = 0.6  "m"//"s"`

Linear momentum,

p = mv = 2 x 0.6 = 1.2 kgm/s.