Advertisements
Advertisements
प्रश्न
Power spent by a body depends on the time for which it does work.
पर्याय
True
False
Advertisements
उत्तर
True.
APPEARS IN
संबंधित प्रश्न
No work is done by a force if the body
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
How is work related to energy?
Explain by an example that a body may possess energy even when it is not in motion.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
A force can cause an object to change its ______.
Write the two main conditions are needed for work to be done?
