S.I unit of power is
Js-2
Watt
Joule
Ws-1
A particle of mass 2kg was initially at rest,if a force of 10 N is applied for 10 seconds, the kinetic energy of the particle is
25J
2500J
250J
24000J
A freely falling body during its motion possess
Mechanical energy
Only potential energy
Only kinetic energy
No mechanical energy.
A force of 15 N is required to pull up a body of mass 2 kg through a distance 5 m along an inclined plane making an angle of 30o with the horizontal as in given figure.Then the work done by the force in pulling the body is
15 J
30 J
50 J
75 J
When a body whirled is a circle the work done by it is
Positive
Negative
Zero
Infinite
A body of mass 5 kg is taken from a height 5 m to 10 m. Then the increase in its potent energy is __________ . (take g = 10 ms-2)
25 J
250 J
150 J
100 J
A boy of mass 40 kg runs up a flight of 50 steps, each 10cm high in 14 seconds. Then work done by the boy is
392 J
140 J
1960 J
1860 J
In an electric cell, while in use the change in energy isfrom :
electrical to mechanical
electrical to chemical
chemical to mechanical
chemical to electrical
Horse power is the unit of
Work
Force
Energy
Power
What kind of energy transfer takes place in a solar cell?
Light energy is to kinetic energy
Light energy is to potential energy
Light energy is to electrical energy
Light energy is to Mechanical energy