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प्रश्न
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संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Derive a relationship between S.I. and C.C.S. unit of work
When does a force perform work?
Is work done a scalar or a vector physical quantity?
Write an expression for the work done against gravity.
Give an example
Light energy changes to electrical energy.
Give an example
Electrical energy changes to heat energy.
Can two agents, doing the same work, have different power?
Name two places in India where electricity is generated from nuclear power plants.
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
