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PART - 1 CH - 7 Gravitation — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsPART - 1 CH - 7 Gravitation3 Marks
Question
Answer the following :
(a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other
means?
(b) An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity?
(c) If you compare the gravitational force on the earth due to the sun 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 yourself using the data available in the succeeding exercises). However, the tidal effect of the moon’s pull is greater than the tidal effect of sun.Why?
✓

Answer

(a) No, the electric force depends on the nature of the intermediate medium, whereas the intermediate medium has effect on the gravitational force, hence the gravity doesn’t have the function of shielding as such i.e., Gravitational shielding is not possible.
(b) Yes, if the space station is very large then the astronaut can detect the force of gravity because the effect
of gravity is sufficient.
(c) The distance between the earth and moon is very less than the distance between sun and earth. The effect of tide is inversely proportional to the cube of distance, that is, it doesn't obey the square inversely proportional rule which applies to the force of gravity, which is why the moon has more effect on the tide than the sun

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