Question

a disc of radius 0.5 metre has a mass of 3 kg if it rotates at speed at a speed of 300 RPM determine its rotational energy​

Answer 1

Explanation:

Moment of inertia of the disc along a line

Has to its plane and passing through centre =

2

MR

2

.

By using perpendicular axis therom.

moment of inertia through axis perpendicular

to plane and passing through point on circumference

= moment of inertia has to plane passing through centre

+ mass × distance between centre and point

=

2

MR

2

+MR

2

=

2

3MR

2

=

2

3×5×0.25

=1.875kgm

2

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