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A force F=ai+3j+6k is acting at a point r=2i-6j-12k. The value of α for which angular momentum about origin is conserved is
Options
(a) 2
(b) zero
(c) 1
(d) -1
Correct Answer:
-1
Explanation:
From Newton’s second law for rotational motion,
τ = dL / dt, if L = constant then τ = 0
So, τ = r × F = 0
(2î – 6ĵ – 12k̂) × (αî + 3ĵ + 6k̂) = 0
Solving we get α = -1.
Related Questions: - Two identical circular coils A and B are kept on a horizontal tube
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Topics: Motion of system of Particles and Rigid Body
(73)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two identical circular coils A and B are kept on a horizontal tube
- A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10cm
- The moment of inertia of a semicircular ring about the centre is
- A small part of the rim of a fly wheel breaks off while it is rotating at a constant
- A body is placed in an insulating container at temperature 227⁰C.
Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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