Physics-
General
Easy
Question
An L shaped thin uniform rod of total length 2l is free to rotate in a vertical plane about a horizontal axis at P as shown in the figure The bar is released from rest. Neglect air and contact friction. The angular velocity at the instant it has rotated through 90° and reached the dotted position shown is
- zero
- none
The correct answer is: none
Related Questions to study
physics-
A thin rod free to rotate about a horizontal axis through one end O is initially in unstable equilibrium position 1 and falls due to gravity on being displaced infinitesimally. In positions 2,3 and 4 it makes 60
, 90 and 180 with the upward vertical. Let 
be angular velocities of the rod in theses positions then
A thin rod free to rotate about a horizontal axis through one end O is initially in unstable equilibrium position 1 and falls due to gravity on being displaced infinitesimally. In positions 2,3 and 4 it makes 60 , 90 and 180 with the upward vertical. Let be angular velocities of the rod in theses positions then
physics-General
physics-
A uniform rod of length L and mass M is free to rotate about a frictionless pivot at one end as shown in the figure. The rod is released form rest in the horizontal position
A uniform rod of length L and mass M is free to rotate about a frictionless pivot at one end as shown in the figure. The rod is released form rest in the horizontal position
physics-General
physics-
A rectangular plate of mass 20kg is suspended from points A and B as shown. If pin B is removed determine the initial angular acceleration 
of plate. 
A rectangular plate of mass 20kg is suspended from points A and B as shown. If pin B is removed determine the initial angular acceleration of plate.
physics-General
physics-
The two small spheres each have a mass of 3 kg and are attached to the rod of negligible mass. A torque M = 8t Nm, where t is in seconds is applied to the rod Find the value of time when each sphere attains a speed of 3 m/s starting from rest.
The two small spheres each have a mass of 3 kg and are attached to the rod of negligible mass. A torque M = 8t Nm, where t is in seconds is applied to the rod Find the value of time when each sphere attains a speed of 3 m/s starting from rest.
physics-General
physics-
The moment of inertia of the pulley system as shown in the figure is 
The radii of bigger and smaller pulleys 2m and 1m respectively The angular acceleration of the pulley system is
The moment of inertia of the pulley system as shown in the figure is The radii of bigger and smaller pulleys 2m and 1m respectively The angular acceleration of the pulley system is
physics-General
physics-
A uniform rectangular solid of side length L and width w placed on a frictionless incline of variable angle, 
. Assume that there is a very tiny peg preventing the box from sliding down the incline at the point labeled P. At what angle of incline will the box begin to tip over?
A uniform rectangular solid of side length L and width w placed on a frictionless incline of variable angle, . Assume that there is a very tiny peg preventing the box from sliding down the incline at the point labeled P. At what angle of incline will the box begin to tip over?
physics-General
physics-
In the figure shown a long cart moves on a smooth horizontal surface due to an external constant force of magnitude F Initial mass of the cart is M0 and velocity is zero At t = 0 sand starts falling from a stationary hopper on to the cart with negligible velocity at constant rate m kg/s and sticks to the cart.
The velocity of the cart at time 
In the figure shown a long cart moves on a smooth horizontal surface due to an external constant force of magnitude F Initial mass of the cart is M0 and velocity is zero At t = 0 sand starts falling from a stationary hopper on to the cart with negligible velocity at constant rate m kg/s and sticks to the cart.
The velocity of the cart at time
physics-General
physics-
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
The mass of the body that was moving faster before the collision is ________ that of other body.
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
The mass of the body that was moving faster before the collision is ________ that of other body.
physics-General
physics-
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
Which line segment corresponds to the motion of the center of mass before and after the collision?
Two bodies have undergone an elastic one–dimensional collision along x–axis Figure is a graph of position versus time for these bodies and for their center of mass.
Which line segment corresponds to the motion of the center of mass before and after the collision?
physics-General
physics-
A disk A of radius r moving on perfectly smooth surface at a speed v undergoes an elastic collision with an identical stationary disk B. Find the velocity of the disk B after collision if the impact parameter is r/2 as shown in the figure
A disk A of radius r moving on perfectly smooth surface at a speed v undergoes an elastic collision with an identical stationary disk B. Find the velocity of the disk B after collision if the impact parameter is r/2 as shown in the figure
physics-General
physics-
A ball of mass 1kg strikes a heavy platform, elastically, moving upwards with a velocity of 5m/s. The speed of the ball just before the collision is 10m/s downwards. Then the impulse imparted by the platform on the ball is
A ball of mass 1kg strikes a heavy platform, elastically, moving upwards with a velocity of 5m/s. The speed of the ball just before the collision is 10m/s downwards. Then the impulse imparted by the platform on the ball is
physics-General
physics-
A smooth semicircular tube AB of radius r is fixed in a vertical plane and contains a heavy flexible chain of length p r and weight Wp r as shown. Assuming a slight disturbance to start the chain in motion, the velocity v with which it will emerge from the open end B of the tube is
A smooth semicircular tube AB of radius r is fixed in a vertical plane and contains a heavy flexible chain of length p r and weight Wp r as shown. Assuming a slight disturbance to start the chain in motion, the velocity v with which it will emerge from the open end B of the tube is
physics-General
physics-
A ball of mass m = 60gm is shot with speed v0 = 22m/s into the barrel of spring gun of mass M = 240g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring.
What fraction of initial kinetic energy of the ball is now stored in the spring?
A ball of mass m = 60gm is shot with speed v0 = 22m/s into the barrel of spring gun of mass M = 240g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring.
What fraction of initial kinetic energy of the ball is now stored in the spring?
physics-General
physics-
A ball of mass m = 60gm is shot with speed v0 = 22m/s into the barrel of spring gun of mass M = 240g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring.
The speed of the spring gun after the ball stops relative to the barrel, is
A ball of mass m = 60gm is shot with speed v0 = 22m/s into the barrel of spring gun of mass M = 240g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring.
The speed of the spring gun after the ball stops relative to the barrel, is
physics-General
physics-
A block of mass M on a horizontal smooth surface is pulled by a load of mass M/2 by means of a rope AB and string BC as shown in the figure. The length & mass of the rope AB are L and M/2 respectively. As the block is pulled from AB = L to AB = 0 its acceleration changes from
A block of mass M on a horizontal smooth surface is pulled by a load of mass M/2 by means of a rope AB and string BC as shown in the figure. The length & mass of the rope AB are L and M/2 respectively. As the block is pulled from AB = L to AB = 0 its acceleration changes from
physics-General
