Chapter 8 – COM, Momentum and Collision
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 8 - COM, Momentum and Collision
After a totally inelastic collision, two objects of the same mass and same initial speeds are found to move together at half of their initial speeds. The angle between the initial velocities of the objects is
27
Nov
After a totally inelastic collision, two objects of the same mass and same initial speeds are found to move together at half of their initial speeds. The angle between the initial velocities of the objects is After a totally inelastic collision two objects of the same mass and same initial speeds are found to move [...]
A circular plate of uniform thickness has a diameter of 28 cm. A circular portion of diameter 21 cm is removed from the plate as shown. Origin is the center of mass of complete plate. The position of center of remaining portion will shift toward left from origin by
27
Nov
A circular plate of uniform thickness has a diameter of 28 cm. A circular portion of diameter 21 cm is removed from the plate as shown. Origin is the center of mass of complete plate. The position of center of remaining portion will shift toward left from origin by A man places a chain of [...]
A particle at rest is constrained to move on a smooth horizontal surface. Another identical particle hits the fractional particle with a velocity v at an angle θ=60^∘ with horizontal. If the particles move together, the velocity of the combination just after impact is equal to
20
Oct
A particle at rest is constrained to move on a smooth horizontal surface. Another identical particle hits the fractional particle with a velocity v at an angle θ=60^∘ with horizontal. If the particles move together, the velocity of the combination just after impact is equal to Two particles are shown in figure. At t=0 a [...]
A ball kept in a close box moves in the box making collisions with the walls. The box is kept on a smooth surface. The velocity of the centre of mass
20
Oct
A ball kept in a close box moves in the box making collisions with the walls. The box is kept on a smooth surface. The velocity of the centre of mass A ball kept in a close box moves in the box making collisions with the walls. The box is kept on a smooth surface. [...]
A ball falls vertically onto a floor with momentum p, and then bounces repeatedly. If the coefficient of restitution is e, then the total momentum imparted by the ball on the floor till the ball comes to rest is
20
Oct
A ball falls vertically onto a floor with momentum p, and then bounces repeatedly. If the coefficient of restitution is e, then the total momentum imparted by the ball on the floor till the ball comes to rest is A ball falls vertically onto a floor with momentum p and then bounces repeatedly. If the [...]
A cracker is thrown into air with a velocity of 10m/s at an angle of 45^∘ with the vertical. When it is at a height of 0.5m from the ground, it explodes into a number of pieces which follow different parabolic paths. What is the velocity of centre of mass, when it is at a height of 1m from the ground? (g=10m/s^2)
20
Oct
A cracker is thrown into air with a velocity of 10m/s at an angle of 45^∘ with the vertical. When it is at a height of 0.5m from the ground, it explodes into a number of pieces which follow different parabolic paths. What is the velocity of centre of mass, when it is at a [...]
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A cracker is thrown into air with a velocity of 10m/s at an angle of 45^∘ with the vertical. When it is at a height of 0.5m from the ground ,
it explodes into a number of pieces which follow different parabolic paths. What is the velocity of centre of mass ,
when it is at a height of 1m from the ground? (g=10m/s^2) ,
A body of mass 3kg moving with a velocity of 4m/s towards left collides head on with a body of mass 4kg moving in opposite direction with a velocity of 3m/s. After collision the two bodies stick together and move with a common velocity which is
20
Oct
A body of mass 3kg moving with a velocity of 4m/s towards left collides head on with a body of mass 4kg moving in opposite direction with a velocity of 3m/s. After collision the two bodies stick together and move with a common velocity which is Two particles are shown in figure. At t=0 a [...]
Two particles are shown in figure. At t=0 a constant force F=6N starts acting on 3kg. Find the velocity of circle of mass of these particle at t=5s.
20
Oct
Two particles are shown in figure. At t=0 a constant force F=6N starts acting on 3kg. Find the velocity of circle of mass of these particle at t=5s. Two particles are shown in figure. At t=0 a constant force F=6N starts acting on 3kg. Find the velocity of circle of mass of these particle at [...]
A man stands at one end of a boat which is stationary in water. Neglect water resistance. The man now moves to the other end of the boat and again becomes stationary. The centre of mass of the ‘man plus boat’ system will remain stationary with respect to water
20
Oct
A man stands at one end of a boat which is stationary in water. Neglect water resistance. The man now moves to the other end of the boat and again becomes stationary. The centre of mass of the ‘man plus boat’ system will remain stationary with respect to water An object initially at rest explodes [...]
A bag of mass M hangs by a long massless rope. A bullet of mass in, moving horizontally with velocity u, is caught in the bag. Then for the combined (bag + bullet) system, just after collision
20
Oct
A bag of mass M hangs by a long massless rope. A bullet of mass in, moving horizontally with velocity u, is caught in the bag. Then for the combined (bag + bullet) system, just after collision A bag of mass M hangs by a long massless rope. A bullet of mass in is caught [...]