By what factor does the kinetic energy of a particle increase if the velocity is increased by a factor of three?
6
7
8
9
Two bodies of equal weight are kept at heights of h and 1.5 h respectively.The ratio of their P.E. is
1:2
2:3
1:3
2:4
1 hp is equal to
0.746 kW
7.46 kW
74.6 kW
746 kW
A person pulls a body on a horizontal surface by applying a force of 5.0 N at an angle of 300 with the horizontal.Find the workdone by this force in displacing the body through 2.0 m?
5√3 J
6√2 J
7√3 J
4√3 J
The energy possessed by a body due to its motion is called
Kinetic energy
Potential energy
Static energy
Mechanical energy
Two girls, each of weight 400 N climb up a rope through a height of 8m. We name one of the girls as A and the other as B. Girl A takes 20s while B takes 50s to accomplish this task. What is the power expended by each girl ?
64 W girl A and 160 W for girl B
128 W girl A and 320 W for girl B
160 W for girl A and 64 W for girl B
320 W for girl A and 128 W for girl B
A force of 7N acts on an object. The displacement is 8m in the direction of force. What is the work done?
24 J
56 J
54 J
64 J
1 kWh =
3.6 x 106 Js
3.6 x 105 Js
3.6 x 109 Js
3.6 x 10-6 Js
Find the energy possessed by an object of mass 10 kg when it is at a height of 6 m above the ground.Given,g = 9.8 m / s2
588 J
688 J
858 J
600 J
A compressed spring possesses
Elastic potential energy
Electrical energy
Magnetic energy
