$3$ particles each of mass $m$ are kept at vertices of an equilateral triangle of side $L$ . The gravitational field at centre due to these particles is

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Important Questions on Gravitation

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 6

At what height above the earth's surface does the acceleration due to gravity fall to

1 %

of its value at the earth's surface?

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 7

A planet has a mass

M_{1}

and radius

R_{1}

. The value of acceleration due to gravity on its surface is

g_{1}

. There is another planet

2

, whose mass and radius both are two times that of the first planet. Which one of the following is the acceleration due to gravity on the surface of planet

2

?

EASY

JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 8

Imagine a new planet having the same density as that of the earth but it is

3

times bigger than the earth in size. If the acceleration due to gravity on the surface of the earth is

g

and on the surface of the new planet is

g^{'}

, then

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JEE Main

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Physics Crash Course JEE Main>Chapter 6 - Gravitation>Level 2>Q 9

Figure given below shows a solid sphere of uniform density and radius $R$ . It applies a gravitational force of attraction equal to $F_{1}$ on a particle placed at $A$ , at distance $2 R$ from the centre of the sphere. When a spherical cavity of radius $\frac{R}{2}$ is made in the cavity as shown, it applies a gravitational force $F_{2}$ on the same particle placed at A. The ratio $\frac{F_{2}}{F_{1}}$ will be :