B and C. The momentum of A is piˆ and that of B is 3–√p jˆ where p is a + ve number. The momentum of C will be
Sahay Sir > Question Answers > B and C. The momentum of A is piˆ and that of B is 3–√p jˆ where p is a + ve number. The momentum of C will be
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 ball is dropped from a height of 45m from the ground. The coefficient of restitution between the ball and the ground is 2/3. What is the distance travelled by the ball in 4th second of its motion. Assume negligible time is spent in rebounding. Let g=10ms^2
20
Oct
A ball is dropped from a height of 45m from the ground. The coefficient of restitution between the ball and the ground is 2/3. What is the distance travelled by the ball in 4th second of its motion. Assume negligible time is spent in rebounding. Let g=10ms^2 An object initially at rest explodes into three [...]
A gun which fires small balls of mass 20 g is firing 20 balls per second on the smooth horizontal table surface ABCD. If the collision is perfectly elastic and balls are striking at the centre of table with a speed of 5m/s at an angle of 60^∘ with the vertical just before collision, then force exerted by one of the legs on ground is (assume total weight of the table is 0.2kg)
20
Oct
A gun which fires small balls of mass 20 g is firing 20 balls per second on the smooth horizontal table surface ABCD. If the collision is perfectly elastic and balls are striking at the centre of table with a speed of 5m/s at an angle of 60^∘ with the vertical just before collision, then [...]
A particle of mass m moving with velocity 1m/s collides perfectly elastically with another particle of mass 2m. If the incident particle is deflected by 90^∘. The heavy mass will make and angle θ with the initial direction of m equal to:
20
Oct
A particle of mass m moving with velocity 1m/s collides perfectly elastically with another particle of mass 2m. If the incident particle is deflected by 90^∘. The heavy mass will make and angle θ with the initial direction of m equal to: An object initially at rest explodes into three fragments A B and C. [...]
A smooth sphere is moving on a horizontal surface with velocity vector 2iˆ+2jˆ immediately before it hits a vertical wall. The wall is parallel to jˆ vector and the coefficient of restitution between the sphere and the wall is e=1/2. The velocity vector of the sphere after it hits the wall is
20
Oct
A smooth sphere is moving on a horizontal surface with velocity vector 2iˆ+2jˆ immediately before it hits a vertical wall. The wall is parallel to jˆ vector and the coefficient of restitution between the sphere and the wall is e=1/2. The velocity vector of the sphere after it hits the wall is An object initially [...]
Two pendulums each of length l are initially situated as shown in Fig. The first pendulum is released and strikes the second. Assume that the collision is completely inelastic and neglect the mass of the string and any frictional effects. How high does the centre of mass rise after the collision?
20
Oct
Two pendulums each of length l are initially situated as shown in Fig. The first pendulum is released and strikes the second. Assume that the collision is completely inelastic and neglect the mass of the string and any frictional effects. How high does the centre of mass rise after the collision? An object initially at [...]
A ball is let fall from a height h0. There are n collisions with the earth. If the velocity of rebound after n collision is vn and the ball rises to a height hn then coefficient of restitution e is given by
20
Oct
A ball is let fall from a height h0. There are n collisions with the earth. If the velocity of rebound after n collision is vn and the ball rises to a height hn then coefficient of restitution e is given by An object initially at rest explodes into three fragments A B and C. [...]
A stationary body of mass 3kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other. One with a velocity of 2iˆm/s and the other with velocity of 3iˆm/s. If the explosion takes place in 10^−5 the average force acting on the third piece in newtons
20
Oct
A stationary body of mass 3kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other. One with a velocity of 2iˆm/s and the other with velocity of 3iˆm/s. If the explosion takes place in 10^−5 the average force acting on the third piece in newtons An object [...]
Two identical balls A and B are released from the position shown in Fig. They collide elastically with each other on the horizontal portion. The ratio of heights attained by A and B after collision is (neglect friction)
20
Oct
Two identical balls A and B are released from the position shown in Fig. They collide elastically with each other on the horizontal portion. The ratio of heights attained by A and B after collision is (neglect friction) An object initially at rest explodes into three fragments A B and C. The momentum of A [...]
A particle of mass m is moving horizontally with a constant velocity v towards a rigid wall that is moving in opposite direction with a constant speed u. Assuming elastic impact between the particle and wall, the work done by the wall in reflecting the particle is equal to :
20
Oct
A particle of mass m is moving horizontally with a constant velocity v towards a rigid wall that is moving in opposite direction with a constant speed u. Assuming elastic impact between the particle and wall, the work done by the wall in reflecting the particle is equal to : An object initially at rest [...]