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 600 kg rocket is set for a vertical firing.If the exhaust speed is 1000 m/s,the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is
117.6 kgs-1
58.6 kgs-1
6 kgs-1
76.4 kgs-1
A particle moves along a straight line such that its displacement at any time t is given by The velocity when the acceleration is zero, is
3 ms-1
-12 ms-1
42 ms-1
-9 ms-1
A person swimming in a fresh water pool obeys
Newton's second law
Gravitational law
Newton's third law
Newton's first law
A car covers the first-half of the distance between two places at 40 km/h and other half at 60 km/h. The average speed of the car is
40 km/h
48 km/h
50 km/h
60 km/h
A light string passing over a smooth light pulley , connects two blocks of masses m1 and m2 (vertically).If the acceleration of the system is (g/8),then the ratio of masses is
8 : 1
9 : 7
4 : 3
5 : 3
A body dropped from top of a tower fall through 40 m during the last two seconds of its fall. The height of tower is( g = 10 m/s2 )
60 m
45 m
80 m
50 m
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
When two bodies stick together after collision, the collision is said to be
Elastic
Inelastic
Partially elastic
None of the above
Which of the following units is associated with energy?
Nm-1
Jm-1
Ns
Kg m2 s-2
