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प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
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उत्तर
Photosynthesis is taking place in a green plant; no work is being done here because there is no direct displacement.
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संबंधित प्रश्न
How much work is done when a body of mass m is raised to a height h above the ground?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
