| ⇦ | 
| ⇨ |
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 sound source is moving towards a stationary listener with 1/10th of the speed
- A block slides from an inclination of 45°.If it takes time twice
- RMS velocity of gas is proportional to
- A small part of the rim of a fly wheel breaks off while it is rotating at a constant
- Which of the following parameters does not characterize the thermodynamic state
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 sound source is moving towards a stationary listener with 1/10th of the speed
- A block slides from an inclination of 45°.If it takes time twice
- RMS velocity of gas is proportional to
- A small part of the rim of a fly wheel breaks off while it is rotating at a constant
- Which of the following parameters does not characterize the thermodynamic state
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