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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.
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(73)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A 0.01 H inductor and √3 πΩ resistance are connected in series
- A parallel plate air capacitor is charged to a potential difference of V volts.
- The current in a conductor varies with time t as I=2t+3t² Where I is in amperes
- A 1 µA beam of protons with a cross-sectional area of 0.5 sq.mm is moving with a velocity
- If the nucleus ²⁷₁₃Al has nuclear radius of about 3.6 fm
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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