Physical independence of force is a consequence of
third law of motion
second law of motion
first law of motion
All of the above
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
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
A passenger in the bus finds that his suit case suddenly starts sliding backwards. This means that the bus is
turning left
turning right
accelerating
retarding
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
A car of mass m is moving with momentum p.If μ be the coefficient of friction between the tyres and the road, what will be stopping distance due to friction alone ?
p2 / 2μg
p2 / 2mμg
p2 / 2m2μg
p2 / 2mg
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 body is placed on an inclined plane and has to be pushed down.The angle made by the normal reaction with the vertical will be
equal to the angle of repose
equal to the angle of friction
less than the angle of repose
more than the angle of friction
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
Consider a car moving along a straight horizontal road with a speed of 72 km/hr.If the coefficient of static friction between the tyres and the road is 0.5,the shortest distance in which the car can be stopped is
(Take g = 10 m/s2)
30 m
40 m
72 m