ROTATIONAL KINETIC ENERGY

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Session
Rotational Mechanics -7
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Session Objective

1. Problems

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Class Exercise - 1
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Solution
Hence, answer is (c).
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Class Exercise - 2
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Solution
Loss in potential energy Gain in
kinetic energy
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Solution contd..
Hence, answer is (b).
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Class Exercise - 3
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Solution
Hence, answer is (b).
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Class Exercise - 4
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Solution
Applying torque equation, torqueof tension about
O TR
Hence, answer is (a).
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Class Exercise - 5
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Solution
Angular momentum Linear momentum
Perpendicular
distance from the axis
Velocity after time t of falling gt
L mgt b
L mgbt (ii)
Hence, answer is (c).
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Class Exercise - 6
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Solution
Hence, answer is (d).
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Class Exercise - 7
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Solution
According to theorem of parallel axis,
Hence, answer is (d).
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