Advertisements
Advertisements
Question
A rigid body rotates with an angular momentum L. If its kinetic energy is halved, the angular momentum becomes, ______
Options
L
L/2
2L
L/`sqrt2`
Advertisements
Solution
A rigid body rotates with an angular momentum L. If its kinetic energy is halved, the angular momentum becomes, `underline(L/sqrt2)`.
APPEARS IN
RELATED QUESTIONS
Answer in brief:
Why are curved roads banked?
While driving along an unbanked circular road, a two-wheeler rider has to lean with the vertical. Why is it so? With what angle the rider has to lean? Derive the relevant expression. Why such a leaning is not necessary for a four wheeler?
The coefficient of static friction between a coin and a gramophone disc is 0.5. Radius of the disc is 8 cm. Initially the center of the coin is 2 cm away from the center of the disc. At what minimum frequency will it start slipping from there? By what factor will the answer change if the coin is almost at the rim? (use g = π2m/s2)
Does the angle of banking depend on the mass of the vehicle?
Derive an expression for maximum safety speed with which a vehicle should move along a curved horizontal road. State the significance of it.
A particle undergoes uniform circular motion. The angular momentum of the particle remains conserved about, ______
When a mass is rotating in a plane about a fixed point, its angular momentum is directed along, ______
Give any two examples of torque in day-to-day life.
What is the relation between torque and angular momentum?
A wheel of radius 2 cm is at rest on the horizontal surface. A point P on the circumference of the wheel is in contact with the horizontal surface. When the wheel rolls without slipping on the surface, the displacement of point P after half rotation of wheel is ______.
