Exercistes

$7\mathrm{.}1$ Answer the following :

$($a$)$ You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shileld a body from the grovitational influence of nearby matter by putuing It inside a hollow sphere or by some other means?

$($b$)$ In astronut inside a sunall space ship orbating around the earth cannot delect gravity. If the space station orbiting around the carth has a lagic siane, can he hope to detect grovily?

$($c$)$ If you compare the gramiational force on the earth due to the sum to that due to the moon, you would find that the Sun's pull is greater than the moon's pull. $($you can check this yournelf using the data wrailable in the sucereding exercises$).$ Why?