When the resultant external torque on a system is zero, the angular momentum of the system
Decreases
Increases
Remains constant
None of the above
A skater, performing a performing a pirouette on the toe of one skate, takes the advantage of
Conservation of momentum
Conservation of angular momentum
Energy conservation
Conservation of kinetic energy
In pure rotation, the center of mass of the rotating body has
Linear velocity
Non-uniform velocity
Zero linear velocity
Maximum velocity
The path of the center of mass of an Indian club (Mugdar) always follows the ________ when thrown vertically upwards.
Hyperbolic path
Parabolic path
Circular path
Zig-zag path
If a cracker explodes in mid air into many fiery pieces, the center of mass of all the fragments of the cracker continuously moves along the
Parabolic path in initial direction
Hyperbolic path
Different path
Parabolic but not in initial direction
A rotating thin wheel can stay upright on its rim for a long time, however, when a thin wheel is stationary, it falls from its vertical position on a small disturbance, because the wheel is in
Non-vertical equilibrium
Stable equilibrium
Unstable equilibrium
None of the above
When a spin is given at the same time to both a hard boiled egg and a raw egg, the torque applied in both the cases is the same, then the angular acceleration of
Hard egg will be less
Both the egg will be the same
Raw egg will be less
Raw egg will be zero
The acceleration of a ring with its M.I. lying about the axis passing through its center and perpendicular to its plane (axis of rotation) rolling down an inclined plane at an angle is
A symmetrical body rotating about its axis of symmetry has moment of inertia 1 kg –m2 and rate of rotation is 8 rev/sec. The kinetic energy of rotation will be
Consider a uniform solid cylinder of radius 0.01m and mass 100 kg wrapped several times with a rope. Pivoted so it can rotate about its axis. The angular acceleration when the rope is pulled with a force of 50 N, is
8 red s-2
16 red s-2
40 red s-2
100 red s-2