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When Can We Talk about Potential Energy

if w1jouke wo...

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if w1jouke work is done against gravitational attraction to carry 10 kg masd from the earth surface to infinity then the magnitude of workdone by gravtational attraction in bringing 20 kg mass from infinity to the cebtre now if w2=n × w1 fin

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W_{1}

work is done against gravitational attraction to carry

10

kg mass from earth's surface to infinity, then the magnitude of work done by the gravitational attraction in bringing

20

kg mass from infinity to the centre of earth is

Q. Assertion :Gravitational potential is maximum at infinity. Reason: Gravitational potential is the amount of work done to shift a unit mass from infinity to a given point in gravitational attraction force field.

Q. If mass of earth is

M

R

and gravitational constant is

G

, then work done to take

1 k g

mass from earth surface to infinity will be:

2 kg

is shifted from infinity to a point in gravitational field, it is found that work done by external force is

- 100 J

. If the mass is doubled and taken again from the same point to infinity without accelerating it, then the work done by gravitational force will be

Q. Assertion :If infinity is taken as reference, the gravitational potential is negative everywhere on the surface of earth. Reason: Every body on its surface is bound to gravitational attraction of earth.

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When Can We Talk about Potential Energy

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