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Class 11 Science Physics Gravitation

A mass

m

is placed inside a hollow sphere of mass M as shown in figure. The gravitaional force on mass

m

is

(a)

\frac{G M m}{R ^{2}}

(b)

\frac{G M m}{r ^{2}}

(c)

\frac{G M m}{( R - r ) ^{2}}

(d)

zero

Correct answer: (d)

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above the earth is the same as at a depth

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below the surface of earth. Then :

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Buoyant force experienced by a solid is _____ the weight of the fluid displaced by it

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A spring balance measures the weight of an object in air to be

0.1 N

. It shows a reading of

0.08 N

when the object is completely immersed in water. If the value of acceleration due to gravity is

10 m / s^{2}

, the volume of the object is

play button image

Construction of submarines is based on

play button image

The ratio of escape velocity at earth

(v_{e})

to the escape velocity at a planet

(v_{y})

whose radius and density are twice

play button image

Two satellites of earth

S_{1}

S_{2}

are moving in the same orbit. The mass of

S_{1}

is four times the mass of

S_{2}

. Which one of the following statements is true?

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A man first swims in sea water and then in river water. Compare the weights of sea water and river water displaced by him.

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Privacy Policy and Terms & Conditions
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Copyright FILO EDTECH PVT. LTD. 2021