Advertisements
Advertisements
प्रश्न
Does the earth move around the sun with a uniform velocity?
Advertisements
उत्तर
No, the earth moves round the sun with a variable velocity. Since the direction of motion changes at each and every point the velocity becomes variable.
APPEARS IN
संबंधित प्रश्न
Define 1 J of work.
When does a force perform work?
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
What is the condition for a force to do work on a body?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Give an example
Light energy changes to electrical energy.
Give an example
Electrical energy changes to heat energy.
State larger units of power.
What is the difference between renewable and non-renewable resources?
