Systems of Part...

Assertion (A) The angular momentum under a central force is constant.
Reason (R) Inverse square law of force is conservative.

A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distance from the hinges for opening or closing the door is

If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take

A solid sphere is rotating in free space. If the radius of sphere is increased keeping mass same which one of the following will not be affected ?

A constant torque acting on a uniform circular wheel changes its angular momentum from A₀ to 4 A₀ in 4 s. The magnitude of this torque is

A particle is projected with a speed v at 45° with the horizontal. The magnitude of angular momentum of the projectile about the point of projection, when the particle is at its maximum height h is

Angular momentum of the particle rotating with a central force is constant due to

A mass m is moving with a constant velocity along a line parallel to x–axis. Its angular momentum with respect to origin on z–axis is

A couple produces

A force of 200 N acts tangentially on the rim of a wheel 25 cm in radius. Find the torque