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Class 11 Science Physics Gravitation

Two particles of equal mass go around a circle of radius R under the action of their mutual gravitational attraction. Find the speed of each particle.

(a)

v = \frac{1}{2 R} (\frac{1}{G m})

(b)

v = (\frac{G m}{2 R})

(c)

v = \frac{1}{2} (\frac{G m}{R})

(d)

v = (\frac{4 G m}{R})

Correct answer: (c)

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M_{e} =

mass of the earth and

R_{e} =

radius of the earth)

play button image

The radii of circular orbits of two satellite

A

B

of the earth are

4 R

R

, respectively. If the speed of satellite

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3 v

, then the speed of satellite

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The height a which the weight of a body becomes

1 / 16 t h

its weight on the surface of earth (radius

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play button image

Two astronauts are floating in gravitational free space after having lost contanct with their spaceship. The two will:

play button image

Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.

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?

play button image

State Archimedes' principle.

play button image

What would be the projections velocity of a satellite so that intersteller (interspace with no gravitation) velocity of the satellite becomes the orbital velocity when it is in the orbit at height of

10 R

from earth's surface, where

R

is the radius of the earth?

play button image

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Copyright FILO EDTECH PVT. LTD. 2021