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प्रश्न
What is meant by power?
एका वाक्यात उत्तर
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उत्तर
The rate of doing work is called power.
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does work.
Write the expression for work done by a force.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
The K.E. of a body is 5 J. What will be its K.E. when its speed is doubled?
What is the amount of energy spent in lifting 1 kg through 1 m? Take g = 10 ms-2.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Give an example
Chemical energy changes to heat energy.
A bullet of mass 25 g has a velocity of 600 ms-1. What is the kinetic energy of the bullet? If it penetrates 50 cm into a target, find the resistive force offered by the target.
Is power a scalar or a vector quantity?
