The momentum is given by p=4t+1, the force at t=2s is-
(A) 4 N
(B) 8 N
(C) 10 N
(D) 15 N
If the momentum of a particle is given by P=(180-8t) kg m/s, then its force will be-
(1) Zero
(2) 8 N
(3) -8 N
(4) 4 N
A force Newton produces acceleration in a body. The mass of the body is (in kg)
(1)
(2)
(3)
(4)
Momentum of a body moving in a straight line is . Find the force acting on a body at t=2 sec
(1) 6 N
(2) 8 N
(3) 4 N
(4) 2 N
When a ball of mass = 5kg hits a bat with a velocity = 3 m/s, in positive direction and it moves back with a velocity = 4 m/s, find the impulse in SI units
1. 5
2. 15
3. 25
4. 35
A particle of mass m has momentum p. it's kinetic energy will be
1. mp
2.
3.
4.
A particle of mass 15 kg has an initial velocity m/s. It collides with another body and the impact time is 0.1 s, resulting in a velocity m/s after impact. The average force of impact on the particle is
1.
2.
3.
4.
A particle of mass m at rest is acted upon by a constant force F for a time t. Its kinetic energy after an interval t is
1.
2.
3.
4.
The magnitude of the impulse developed by a mass of 0.2 kg which changes its velocity from is
1. 2.7 N-s
2. 1.8 N-s
3. 0.9 N-s
4. 3.6 N-s
A soldier is firing 20 bullets per second from his gun having a muzzle speed of 150 m/s. The mass of each bullet is 50 g. If they strike the wall and rebound with the same speed, then the force on the wall is
1. 75 N
2. 150 N
3. 300 N
4. 600 N