| ⇦ | 
| ⇨ |
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: - If α (current gain) of transistor is 0.98, then what is the value of β
- A particle of mass M is executing oscillations about the origin on the x-axis.
- The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt the maximum voltage
- The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,
- MA⁻¹T⁻² is the dimensional formula of
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
- If α (current gain) of transistor is 0.98, then what is the value of β
- A particle of mass M is executing oscillations about the origin on the x-axis.
- The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt the maximum voltage
- The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,
- MA⁻¹T⁻² is the dimensional formula of
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