A motorcyclist going round in a circular track at a constant speed has:
(1) constant linear velocity.
(2) constant acceleration.
(3) constant angular velocity.
(4) constant force.
A particle P is moving in a circle of radius ‘a’ with a uniform speed v. C is the centre of the circle and AB is a diameter. When passing through B the angular velocity of P about A and C are in the ratio
(1) 1 : 1
(2) 1 : 2
(3) 2 : 1
(4) 4 : 1
A particle moves with constant angular velocity in a circle. During the motion its
(1) Energy is conserved
(2) Momentum is conserved
(3) Energy and momentum both are conserved
(4) None of the above is conserved
Two bodies of mass 10 kg and 5 kg moving in concentric orbits of radii R and r such that their periods are the same. Then the ratio between their centripetal acceleration is
A particle is moving in a horizontal circle with constant speed. It has constant
(3) Kinetic energy
The angular speed of a flywheel making 120 revolutions/minute is:
Certain neutron stars are believed to be rotating at about 1 rev/sec. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be
An electric fan has blades of length 30 cm as measured from the axis of rotation. If the fan is rotating at 1200 r.p.m, the acceleration of a point on the tip of the blade is about
(1) 1600 m/sec2
(2) 4740 m/sec2
(3) 2370 m/sec2
(4) 5055 m/sec2
The angular speed of seconds needle in a mechanical watch is:
(2) 2π rad/s
(3) π rad/s
What is the value of linear velocity, if and