Rotational Motion Question 199

Question: Point masses 1, 2, 3 and 4 kg are lying at the points (0,0,0), (2,0,0), (0,3,0) and (-2, -2,0) respectively. The moment of inertia of this system about X-axis will be

Options:

A) 43kgm2

B) 34kgm2

C) 27kgm2

D) 72kgm2

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Moment of inertia of the whole system about the axis of rotation will be equal to the sum of the moments of inertia of all the particles.

I=I1+I2+I3+I4

=0+0+27+16=43kgm2



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