50 g bullet is fired from a 3 kg rifle. The bullet moves with a velocity of 5 m/s.At what velocity, the rifle will recoil?
(a) 0.05 m/s
(b) 0.06 m/s
(c) 0.07 m/s
(d) 0.08 m/s
The momentum gained by rocket is equal to __________________.
(a) Momentum of the gas expelled from the engine
(b) Momentum of the space around the rocket
(c) Both of them
(d) None of these
In order to provide enough upward thrust to over come gravity, a typical rocket consumes fuel about __________.
(a) 10 kg/s
(b) 100 kg/s
(c) 1000 kg/s
(d) 10000 kg/s
In order to proide enough upward thrust to overcome gravity, a typical rocket ejects the burnt gases at speeds of over
(a) 40 m/s
(b) 400 m/s
(c) 4000 m/s
(d) 40000 m/s
How much of the launch mass of a rocket consists of fuel only?
(a) 10%
(b) 30 %
(c) 50 %
(d) 80 %
A rocket consumes 10000 kg/s of fuel and ejects the burnt gases at a speed of 4900 m/s.What will be the thrust produced by the engine on the body of the rocket?
(a) 5.6 MN
(b) 4.9 MN
(c) 4.2 MN
(d) 3.5 MN
When the fuel in the rocket is burnt and ejected then _____________________________________.
(a) The mass of the rocket decreases
(b) The acceleration of the rocket increases
(c) Both of them
(d) None of these
A ball is thrown from a point 5 m above the ground. What horizontal distance does the ball cover in 10 s if the horizontal velocity has the magnitude of 10 ms^-1?
(a) 100 m
(b) 200 m
(c) 300 m
(d) 400 m
A stone is fallen from the edge of the building so that it reaches the ground in 12 s. What vertical distance does the stone cover?
(a) 4140 m
(b) 3600 m
(c) 706 m
(d) 189 m
Projectile motion is two dimensional motion under constant acceleration due to _____________.
(a) Friction
(b) Gravity
(c) Centripetal force
(d) None of these