Which of the following are correct?A. An astronaut going from the earth to the Moon will experience weightlessness once.B. When a thin uniform spherical shell gradually shrinks maintaining its shape, the gravitational potential at its centre decreases.C. In the case of a spherical shell, the plot of `V` versus `r` is continuous.D. In the case of a spherical shell, the plot of gravitational field intensity `I` versus `r` is continuous

Which of the following are correct?A. An astronaut going from the eart

1.	Which of the following are correct?A. An astronaut going from the earth to the Moon will experience weightlessness once.B. When a thin uniform spherical shell gradually shrinks maintaining its shape, the gravitational potential at its centre decreases.C. In the case of a spherical shell, the plot of `V` versus `r` is continuous.D. In the case of a spherical shell, the plot of gravitational field intensity `I` versus `r` is continuous
Answer» Correct Answer - A::B::C a. For a proper explanation , the earth Moon system will be regared as an isolated system. At a particular point in space, the gravitational force of attraction of the earth on astronaut will be balanced by the gravitational force of attraction of the Moon. b. `V=-GM//r` . As `R` decreases, `GM//R` increases or `-GMM//R` decreases. c. In case of the sphereical shell, plot of `I` versus `r` is dicontinous.

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