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4 September, 13:16

Two particles (m1 = 0.20 kg, m2 = 0.30 kg) are positioned at the ends of a2.0-m long rod of negligible mass. What is the moment of inertia ofthis rigid body about an axis perpendicular to the rod and throughthe center of mass? A) 0.48 kg * m2B) 0.50 kg * m2C) 1.2 kg * m2D) 0.80 kg * m2E) 0.70 kg * m2

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  1. 4 September, 13:50
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    Option (A)

    Explanation:

    m1 = 0.2 kg

    m2 = 0.3 kg

    L = 2 m

    Let the centre of mass is at a distance d from 0.2 kg.

    So, m1 x d = m2 x (L - d)

    0.2 x d = 0.3 x (2 - d)

    2 d = 6 - 3d

    5 d = 6

    d = 1.2 m

    Moment of inertia about the centre of mass,

    I = m1 x d^2 + m2 x (L - d) ^2

    I = 0.2 x 1.2 x 1.2 + 0.3 x 0.8 x 0.8

    I = 0.288 + 0.192

    I = 0.48 kg m^2

    Thus, option (A) is correct.
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