Question 1 :
A machine gun fires n bullets per second and the mass of each bullet is m. If v is the speed of each bullet then force exerted on machine gun is
Question 2 :
<span>A body of mass $m$ hits normally a rigid wall with velocity $v$ and bounces back with the same velocity. The impulse experienced by the body is:</span>
Question 3 :
A body of mass $2$ kg collides with a wall with speed 100 $ms^{-1}$ and rebounds with same speed. If time of contact was $\displaystyle \frac{1}{50}$ sec, the force exerted on the wall is
Question 4 :
A ball weighing $10 g$ hits a hard surface vertically with a speed of $5 {m}/{sec}$ and rebounds with the same speed. The ball remains in contact with the surface for ${1}/{100} sec$. The average force exerted by the surface on the ball is
Question 5 :
If force F =(500 - 100)t, then impulse as a function of time will be:-
Question 6 :
<b>STATEMENT - 1 :</b> Gas ejected from rocket will never exert thrust on the rocket if the ejected gas and the rocket move in the same direction.<br/><b>STATEMENT - 2 :</b> To exert thrust on rocket in its direction of motion, the ejected gas (w.r.t. rocket) must move opposite to the velocity of rocket (w.r.t. ground).<br/>
Question 7 : From Newton's third law,  Action and reaction____.<div>Which of the following will not fit in the above sentence.</div>
Question 8 :
A ball mass 1 kg moving with speed $10{ ms }^{ -1 }$ strikers a wall and comes to rest. The impulse of the force on the ball is of magnitude
Question 9 :
A man is standing on a boat in still water. If he walks towards the shore the boat will :<br/>
Question 10 :
A force of $50 \ dynes$ is acted on a body of mass $5 g$ which is at rest for an interval of $3 s$, then impulse  is:<br/>
Question 11 :
Total impulse imposed by a ball of mass $2 kg$ moving with the speed of $10 m/s$ in rightward direction to the ball of mass $4 kg$ moving with the speed of $8 m/s$ in the same direction is (The collision is perfectly elastic)
Question 12 :
A body of mass $M$ hits normally a rigid wall with velocity $V$ and bounces back with the same velocity. The impulse experienced by the body is
Question 13 :
A puck of hockey is sliding on the ice with a momentum of 5 kg-m/s when it is struck by a hockey stick giving it an impulse of 100 N. s in the direction of motion of the puck. Calculate the momentum of the puck after hitting by the hockey stick ?<br/>
Question 14 :
Two people push a car for 3 sec, with a combined net force of 200 N.The impulse provided to the car............
Question 15 :
A bullet of mass $50\ g$ travelling at $500\ m/s$ penetrates $100\ cm$ into a wooden block. Find the average force exerted on the block.
Question 16 :
If a force of $200N$ acts on a body. The momentum acquired is $100kg$ $m/s$. What is the period for which force acts on the body?
Question 17 :
A fish is swimming in the ocean. Which of the following represents the interaction between the fish and the water?<br/>
Question 18 :
A cricket ball of mass 120 g is moving with a velocity of 12 m $s^{-1}$. It turns back and moves with a velocity of 20 m $s^{-1}$ when hit by a bat. Find the impulse if the force acts on the ball for 0.02 s.
Question 19 :
From a stationary tank of mass $125000$ pound, a small shell of mass $25$ pound is fired with a muzzle velocity of $1000\ ft/sec$. The tank recoils with a velocity of ..........
Question 20 :
A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontal, in 2 s. Each bullet has a mass of 10 g with a muzzle velocity of $800{ ms }^{ -1 }.$ The final velocity acquired by the person and the average force exerted on the person are
Question 21 :
A bullet of mass $5$ g is shot from a gun of mass $5$ kg. The muzzle velocity of the bullet is 500 m/s. The recoil velocity of the gun is
Question 22 :
A Gardner waters the plants by a pipe of diameter $1\ mm$. The water comes out at the rate or $10\ cm^{3}/sec$. The reaction force exerted on the hand of the Gardner is:
Question 23 :
A man fires a bullet of mass $200\ g$ at a speed of $5\ m/s$. The gun is of mass $1\ kg$. The velocity with which the gun will recoil backward is:
Question 25 :
A ball of mass 50 gm is dropped from a height h = 10 m. It rebounds losing 75 percent of its kinetic energy. If it remains in contact with the ground for At =0.01 sec, the impulse of the impact force is<br/>(take 9 = 10 $m/s^2$<span>)</span>
