⇦ | ⇨ |
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: - Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial.
- An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor
- Two sources P and Q produce notes of frequency 660 Hz each.
- In a thermodynamic system, working substance is ideal gas. Its internal energy
- A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground 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
- Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial.
- An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor
- Two sources P and Q produce notes of frequency 660 Hz each.
- In a thermodynamic system, working substance is ideal gas. Its internal energy
- A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground 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