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 body at height possesses:
Kinetic energy
potential energy
solar energy
heat energy
When a body moves at an angle θ to the direction of force,work done is given by
F x S
F x s cos θ
F / S
F cos θ / s
A boy weighing 350 N runs up a flight of 30 steps, each 20 cm high in 1 minute. Then the work done is
3500 J
4200 J
2100 J
1500 J
S.I unit of power is
Js-2
Watt
Joule
Ws-1
When a body moves in a circular path how much work is done by the body?
1 J
0
9.8 Nm
None of these
If the velocity of a moving body is doubled,the kinetic energy will be
Doubled
Halved
Four times
One-fourth
When an electric motor works what kind of energy transfer take place?
Electrical energy to potential energy
Electrical energy to Mechanical Energy
Mechanical energy to electrical energy
Kinetic energy to electrical energy.
When a force applied to a body produces a displacement perpendicular to the direction of force,the work done is
positive
Negative
Zero
Maximum
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
