All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 2

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Distance between the centres of two stars is $10 a$ . The masses of these stars are $M$ and $16 M$ and their radii are $a$ and $2 a$ respectively. A body of mass $m$ is fired straight from the surface of the larger star towards the smaller star. The minimum initial speed for the body to reach the surface of the smaller star is _____.

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Important Questions on Gravitation

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 3

A satellite is launched in a circular orbit of radius

R

. Another satellite is also launched in an orbit of radius

1.1 R

. The period of the second satellite is larger than the first by approximately.

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 4

If earth comes closer to sun by $3 / 4 th$ of the present distance, then the year of the earth consists of how many days?

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 5

Communication satellites move in orbits of the radius of

44400 km

around the earth. Assume that the only force acting on it is that due to the earth, then what is the acceleration of such a satellite? (Take, the mass of earth

= 6 \times 10^{24} kg

)

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 6

The mean radius of the Earth's orbit around the sun is

1.5 \times 10^{11} m

. The mean radius of the orbit of Mercury around the sun is

6 \times 10^{10} m

. The Mercury will rotate around the sun in _____.

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 7

A tank of

5 m

high is filled with water and then is filled to the top with oil of density

0.85 g / {cm}^{3}

. The pressure at the bottom of the tank, due to these liquids is _____.

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 8

A wooden block of volume

1000 {cm}^{3}

is suspended from a spring balance. It weighs

12 N

in air. It is suspended in water such that half of the block is below the surface of the water. The reading of the spring balance is _____.

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 9

A body is floating in water with

2 / 3

of its volume below the surface of the water. What is the density of the body?

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All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 10

A body of mass

6 kg

immerses in water partially. If the body displaces

100 g

of water, then the apparent weight of the body is _____.