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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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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In radioactive element, β-rays are emitted from
- A coil of 40 henry inductance is connected in series with a resistance of 8 ohm
- If radius of the ₁₃Al²⁷ nucleus is taken to be Rᴀı, then the radius of ₅₃Te¹²⁵ nucleus
- The self-inductance of a coil having 500 turns is 50mH. The magnetic flux
- The kirchoff’s first law (∑i=0) and second law (∑iR=∑E), where the symbols
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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