When a bullet of mass 5kg is fired, the impulse on it is 200Ns. If the mass of the gun is 10kg, then the recoil velocity of the gun is
20ms-1
2ms-1
0.2ms-1
0.02ms-1
To avoid slipping while walking on ice one should take smallest steps because of the
larger friction
larger normal reaction
smaller friction
smaller normal reaction
A block of mass 50 kg just slides over a horizontal distance of 1 m. If coefficient of friction between their surfaces is 0.2, the work done against friction is
98 J
56 J
72 J
34 J
A particle of mass m is moving a uniform velocity v1. It is given an impulse such that its velocity becomes v2. The impulse is equal to
m[v1+v2]
m[v2-v1]
Two forces of 6N and 8N act on a body of mass 7kg. The maximum value of acceleration produced cannot be more than
4ms-1
6ms-1
8ms-1
A heavy uniform chain lies on horizontal table top. If the coefficient 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 smooth inclined plane has length 10m and the angle of inclination is 300. A body of mass 2kg 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 2 kg begins to slide down a plane inclined at an angle of 450 with the horizontal. The force of friction will be
19.6 sin450
9.8 sin450
19.6 cos50
9.8 cos450
A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g=10ms2, the tension in the supporting cable is
8600 N
9680 N
11000 N
1200 N
A rocket with a lift of mass 20,000 kg is blasted upward with an initial acceleration of 5 m/s2 .Calculate the initial thrust of the blast?
3.25 x 105 N
2.96 x 105 N
4.35 x 105 N
1.45 x 105 N
