A block of mass 2 kg rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is
9.8 N
0.7 x 9.8 x √3 N
9.8 x √3 N
0.7 x 9.8 N
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 %
Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
A smooth inclined plane has length 10 m and the angle of inclination is 300. A body of mass 2 kg is released from rest at the top of the inclined plane. What is its acceleration down the inclined plane?
10 ms-2
5√3 ms-2
5 ms-2
20/√3 ms-2
A body of mass 10 kg falls vertically on a muddy ground with a velocity of 20 m/s and penetrates through a vertical depth of 0.3 m.Calculate the average force exerted by the muddy ground.Take g = 10 m/s2 .
6767 N
7894 N
7845 N
5894 N
Two trains A and B are running in the same direction on parallel tracks such that A is faster than B.If packets of equal weight are exchanged between the two, then
A will be retarded but B will be accelerated
A will be accelerated but B will be retarded
there will not be any change in the velocity of A but B will be accelerated.
there will not be any change in the velocity of B,but A will be accelerated.
A fireman wants to slide down a rope. The breaking load for the rope is 3/4th of the weight of the man. With what minimum acceleration should the fireman slide down? Acceleration due to gravity is g.
1/4 g
1/2g
3/4g
zero
A cricket player catches a ball of mass 100 g and moving with a velocity of 25 ms-1. If the ball is caught in 0.1s, the force of the blow exerted on the hand of the player is
4 N
25 N
40 N
250 N
If the force on a rocket moving with a velocity of 300 m/s is 345 N, then the rate of combustion of the fuel ,is
0.55 kg/s
0.75 kg/s
1.15 kg/s
2.25 kg/s
A block of 10 kg is pulled at a constant speed on a rough horizontal surface by a force of 20 N.Find the co- effecient of kinetic friction .Given that g = 10 m/s2 .
0.2
0.5
0.85
0.7
