A shell of mass 0.020 kg is fired by a gun of mass 100 kg . If the muzzle speed of the shell is 80ms-1. What is the recoil speed of gun.
15 cm-1
1.6 cms-1
1.9 cms-1
2 cms-1
A bats man deflect a ball by an angle of 45o without changing its initial speed which is equal to 54km|hr Mass of ball is 0.15kg. What is the impulse imparted to the ball?
4.2 kgms-1
5 kgms-1
10kgms-1
15 kgms-1
A helicopter of mass 1000 kg rises with a vertical acceleration of 15ms-2. The crew and the passenger weight 300 kg give the magnitude force on the floor by the crew and passenger.
10 N
zero
7.5 × 103N
8 N
Linear momentum of a ball of mass 5 g is 0.5 kg ms-1.Calculate the velocity.
10ms-1
5ms-1
0
15ms-1
When the glass vessels fall on a hard floor they break, but they do not break when the fall on a carpet or sand. Which law is used?
Newton's 1st law
Newton's 2nd law
Newton's 3rd law
law of conservation of momentum
A bullet of mass m, is fired into a large block of wood of mass M with velocity v. The final velocity of the system is
v/(M + m)
v(M + m)/m
(mv/M)
mv/(M + m)
A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved?
PE alone
KE alone
Momentum
Momentum and KE
