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प्रश्न
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उत्तर
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संबंधित प्रश्न
Define the term energy.
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
Is work done a scalar or a vector physical quantity?
Give an example
Chemical energy changes to electrical energy.
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
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.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
