The rear side of a truck is open and a box of 50 kg mass is placed 5 m away from the rear end.The coefficient of friction between the box and the surface below it is 0.15.On a straight road the truck starts from rest and accelerates at 2 m/s2 .At what distance from the starting point does the box fall off the truck ?(g = 10 m/s2 )
10 m
5 m
25 m
20 m
An air craft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15° .What is the radius of the loop?
13 x 103 m
15.2 x 103 m
13.6 x 103 m
None of these
When a bullet of mass 5 kg is fired, the impulse on it is 200 Ns. If the mass of the gun is 10 kg, then the recoil velocity of the gun is
20 ms-1
2 ms-1
0.2 ms-1
0.02 ms-1
A body of mass 0.1 kg attains a velocity of 10 m/s in 0.1s.The force acting on them is:
10 N
0.001 N
0.01 N
1000 N
Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
A person swimming in a fresh water pool obeys
Newton's second law
Gravitational law
Newton's third law
Newton's first law
A block of metal of mass 2 kg is resting on a frictionless floor.It is struck by a jet releasing water at the rate of 1 kg/sec and at a speed of 5 m/s.What will be the initial acceleration of the block ?
3.5 m/s2
4.5 m/s2
2.5 m/s2
none of these
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 shell is fired from a canon, it explodes in mid air, its total
momentum increases
momentum decreases
kinetic energy increases
kinetic energy decreases
A 10 kg stone is suspended with a rope of breaking stength 30 kg wt.The minimum time in which the stone can be raised through a height 10 m starting from rest is (taking g = 10 N/kg):
0.5 seconds
1.0 seconds
√2 / √3 seconds
2.0 seconds
