| ⇦ | 
| ⇨ |
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: - A Si and a Ge diode has identical physical dimensions. The bandgap in Si is larger
- The breaking stress of a wire depends upon
- In an A.C circuit of capacitance the current from potential is
- A current I flows along the length of an infinitely long, straight, thin walled pipe.
- The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
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
- A Si and a Ge diode has identical physical dimensions. The bandgap in Si is larger
- The breaking stress of a wire depends upon
- In an A.C circuit of capacitance the current from potential is
- A current I flows along the length of an infinitely long, straight, thin walled pipe.
- The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
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
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply