Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 6

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Consider two solid spheres of radii $R_{1} = 1 m$ , $R_{2} = 2 m$ and masses $M_{1}$ and $M_{2},$ respectively. The gravitational field due to sphere $(1)$ and $(2)$ are shown. The value of $\frac{M_{1}}{M_{2}}$ is:

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Important Questions on Gravitation

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 7

The ratio of radii of two planets is

p

and the ratio of accelerations due to gravity at their surfaces is

q

. The ratio of escape velocities from their surfaces will be

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 8

Which of the following graphs represent the time period of the planet moving around the sun? [

R

is semi-major axis of the path.]

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 9

The figure shows an elliptical path

A B C D

of a planet around the sun

S

such that the area of triangle

C S A

is

\frac{1}{4}

the area of the ellipse. (see figure) with

D B

as the major axis, and

C A

as the minor axis. If

t_{1}

is the time taken for the planet to go over path

A B C

and

t_{2}

for path taken over

C D A

then:

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 10

The distance of a geostationary satellite from the centre of the earth (Radius,

R = 6400 km

) is nearest to

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 11

If the period of a satellite in a circular orbit of radius

R

is

T

, then the period of another satellite in a circular orbit of the radius

4 R

is

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 12

Assertion: Gravitational potential of the earth at every place on its is negative. (taking potential at infinity to be zero)

Reason: Everybody on earth is bound by the attraction of earth.

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 14

The altitude at which acceleration due to gravity decreases by

0.1 %

approximately is (radius of the earth

= 6400 km

),

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Physics Crash Course NEET>Chapter 6 - Gravitation>Level 3>Q 15

Weight of a body of mass

m

decreases by

1 %

when it is raised to a height

h

above the earth's surface. If the body is taken to same distance

h

below in a mine, then its weight will