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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
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संबंधित प्रश्न
Define the term energy.
Is work a scalar or a vector quantity?
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.
Define 'joule'.
Fill in the boxe to show the corresponding energy transformation.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
Is power a scalar or a vector quantity?
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
