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Byju's Answer
Standard XII
Physics
Rotational Work and Energy
A ring of rad...
Question
A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with an angular velocity of 20 rad/s.
Its kinetic energy is
A
10 J
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B
100 J
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C
500 J
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D
250 J
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Solution
The correct option is
D
250 J
Rotational kinetic energy
1
2
I
ω
2
=
1
2
(
1
2
M
R
2
)
ω
2
=
1
2
(
1
2
×
10
×
(
0.5
)
2
)
(
20
)
2
=
250
J
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