alleryStart learning →A wheel of I = 4 kg m² gains angular acceleration 2.5 rad/s². The torque in N m is
- 10
- 1.6
- 6.5
- 20
Show answer and solution
Correct answer: A. 10
Torque = Iα = 4 x 2.5 = 10 N m.
MHT-CET Rotational Dynamics — practice questions — page 3
Explore 64 free Rotational Dynamics questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.
Practise Rotational Dynamics with Quill →Rotational Dynamics questions and exercises with answers
Showing questions 61–64 of 64.
A wheel of I = 4 kg m² gains angular acceleration 2.5 rad/s². The torque in N m isRead the answer and worked solution →A ring of mass 2 kg has I = 2 kg m² about its axis. Its radius of gyration isRead the answer and worked solution →Moment of inertia of a uniform solid ball (mass M, radius R) about a diameter isRead the answer and worked solution →For a slender rod (mass M, length L), I about the perpendicular through its middle isRead the answer and worked solution →
Worked practice questions
A ring of mass 2 kg has I = 2 kg m² about its axis. Its radius of gyration is
- 0.5 m
- 1 m
- 2 m
- 4 m
Show answer and solution
Correct answer: B. 1 m
K = √(I/M) = √(2/2) = 1 m.
Moment of inertia of a uniform solid ball (mass M, radius R) about a diameter is
- MR²
- 2MR²/3
- 2MR²/5
- MR²/2
Show answer and solution
Correct answer: C. 2MR²/5
Integration over a uniform solid sphere gives two fifths of MR² about a diameter.
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