Question

A uniform thin rod of length 1m and mass 3kg is attached to a uniform thin circular disc of radius 30cm and mass 1kg at its centre perpendicular to its plane.The centre of mass of the combination from the centre of disc is

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Answer 1

Answer:

A uniform thin rod of length 1m and mass 3kg is attached to a uniform thin circular disc of radius 30cm and mass 1kg at its centre perpendicular to its plane. The centre of mass of the combination from the centre of disc is 4.045kg/m^2

Explanation:

According to the problem the center of the disc will be the center of mass.

moment of inertia of the rod + moment of inertia of the disc= Moment of inertia of the combination.

I= M1L^2/12+ M2 R^2/2

= 3x(1)^/12+ 1(30*10^(-2))^2/2

 = 4+ 4.5 x 10^(-2) kg m^2

  = 4.045 kg m^2

 

Answer 2

Thank you very much Suresh bro.