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प्रश्न
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उत्तर
The work done by the gravitational force of the sun on earth during its motion around the sun is zero because at every point, the displacement of earth is perpendicular to the gravitational force of sun i.e.,
W = Fd cos 900 = 0
संबंधित प्रश्न
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Give one example in which a force does zero work.
Explain the difference between a uniform linear motion and a uniform circular motion.
Distinguish between work and power.
What do you understand by ‘potential energy’? Give three examples to illustrate your answer.
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
Is power a scalar or a vector quantity?
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
What is work?
