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Torque

About which o...

Question

About which of the following axes, the moment of inertia of a thin circular disc is minimum?

A

Through centre perpendicular to the surface

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B

Through centre parallel to the surface

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C

Tangential and perpendicular to the surface

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D

Tangential and parallel to the surface

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Solution

The correct option is A Through centre perpendicular to the surface

Through area perpendicular to the surface.
A body of man $= 2$ kg $(m)$
Constant velocity $= 4$ m/s
To bring it to rest $V_{1} = 0$ when
distance taken $S = 4 m$
$W = F d$
$= m a d$
$= 2 \times (\frac{4 - 0}{t}) \times 4 m = 32 J$

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