Which of the following is not possible in the absence of gravitational force?

Revolution of planets around the sun

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Placing things firmly on the surface of earth

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Formation of tides

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All of the above

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Solution

The correct option is D All of the above
Gravitational force is very important because it plays a major roll in various activities like revolution of plants, formation of tides etc. The gravitational pull of the sun holds the plants in place and causes them to revolve around the sun. Tides are caused due to the combined effect of gravitational force of sun and Moon. Earth's gravitational force pulls all the objects on its surface towards itself thus it is possible to keep object firmly in their place.

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