Explain A cosmonaut in a satellite which is in a free circular orbit around the earth experiences the sensation of weightlessness even though there is influence of gravitational field on earth.

The sensation of weight is caused by the reaction of the floor on a person. In orbit, the cosmonaut and the floor have the same acceleration towards the centre of the earth. The floor exerts no supporting force on the cosmonaut. (i.e. the reaction, R = 0)

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