Physics Test 75

Result

Physics Test 75

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Question 1
4 / -1

The radius of gyration of a body about an axis at a distance of 6 cm from its centre of mass is 10 cm. Then its radius of gyration about a parallel axis passing through its centre of mass will be

A
80 cm

B
8 cm

C
0.8 cm

D
80 m

Solution

I = I_CM + Md²

I_CM = I – Md²

Mk² = Mk'² – Md²

where, k and k' be the radii of gyration of the about the axis passing through the centre of mass and another axis at a distance of d = 6 cm from the centre of mass respectively.

Mk² = M(10)² – M(6)²

k² = (10)² – (6)² = 64 ⇒ k = 8 cm