Advertisements
Advertisements
प्रश्न
State the S.I. unit of work and define it.
उत्तर
S.I. unit of work is Joule
Joule “Is that much work done when a force of IN displaces the body through a distance of lm in the direction of the force.”
APPEARS IN
संबंधित प्रश्न
The moon is revolving around the earth in a circular path. How much work is done by the moon?
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
What is the condition for a force to do work on a body?
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
(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.
Define energy and state the unit of energy and the law of conservation of energy.
Give an example
Electrical energy changes of sound energy.
Give an example
Chemical energy changes to electrical energy.
What are the advantages and disadvantages of using solar cells for producing electricity?
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
What is work?
