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संबंधित प्रश्न
What do you mean by degradation of energy?
Define 1 joule of work.
What are the quantities on which the amount of work done depends? How are they related to work?
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
Give two examples of couple action in our daily life.
Explain the difference between a uniform linear motion and a uniform circular motion.
A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
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
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
Name two places in India where electricity is generated from nuclear power plants.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
