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प्रश्न
What do you mean by degradation of energy?
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उत्तर
During the transformation of energy from one form to another desired form, some part of the energy is converted to some undesirable form or a part of it is lost to the surroundings due to the friction or radiations that cannot be used for any productive purpose. This is called dissipation of energy or degradation of energy.
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संबंधित प्रश्न
Give one example in which a force does zero work.
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
In case of negative work, the angle between the force and displacement is :
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
A is a push or a pull ______.
A ______ should act on an object.
What is work?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
