A gun of mass 1kg fires a bullet of mass 1g with a velocity of 1ms-1.The recoil velocity of the gun is
1ms-1
0.1ms-1
0.01ms-1
0.001ms-1
Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
A horse pulls the cart. Which of the following forces makes the cart move?
force exerted by the horse on the cart
force exerted by the ground on the cart
force exerted by the ground on the horse
force exerted by the horse on the ground
What should be the tension in a rope pulling vertically upward a mass of 100 kg so that starting from rest it acquires a velocity of 4 m/s in 1.5 seconds?
1278 N
1247 N
1287 N
1894 N
A drum of radius R and mass M ,rolls down without slipping along an inclined plane of angle θ.The frictional force
converts translational energy to rotational energy
dissipates energy as heat
decreases the rotational motion
decreases the rotational and translational motion
A heavy uniform chain lies on horizontal table top.If the coeffecient of friction between the chain and the table surface is 0.25,then the maximum friction of the length of the chain that can hang over one edge of the table is
20 %
25 %
35 %
15 %
A machine gun has a mass of 10 kg.It fires 30 g bullets at the rate of 6 bullets per second with a speed of 400 m/s.What force must be applied to the gun to keep it in position ?
72 N
75 N
82 N
97 N
Two forces of 6N and 8N act on a body of mass 7kg. The maximum value of acceleration produced cannot be more than
2ms-1
4ms-1
6ms-1
8ms-1
A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s.The man holding it can exert a maximum force of 144 N on the gun.How many bullets can he fire per second at the most ?
one
four
two
three
A lift is moving upward with increasing speed with acceleration 'a'.The apparent weight will be :
less than the actual weight
more than the actual weight and have a fixed value
more than the actual weight which increases as long as velocity increases
zero