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Which of the following symptoms is likely to afflict an astronaut in space?

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Important Questions on Gravitation

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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.1

Choose the correct answer from among the given ones:

The gravitational intensity at the centre of a hemispherical shell (C) of uniform mass density has the direction indicated by the arrow (see Figure).

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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.11

Choose the correct answer from among the given ones:
The direction of the gravitational intensity at an arbitrary point P is indicated by the arrow.

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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.12
A rocket is fired from the earth towards the sun. At what distance from the earth’s centre, the gravitational force on the rocket is zero? Mass of the sun =2×1030 kg, mass of the earth =6×1024 kg. Neglect the effect of other planets, etc. (orbital radius =1.5×1011 m). 
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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.13
How will you ‘weigh the sun’, that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5 × 108 km. 
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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.14
A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50 × 108 km away from the sun? 
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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.15
A body weighs 63 N on the surface of the earth. What is the gravitational force on it (in newton) due to the earth at a height equal to half the radius of the earth? 
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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.16
Assuming the earth to be a sphere of uniform mass density, how much would a body weigh (in newton) halfway down to the centre of the earth if it weighed 250 N on the surface?
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PHYSICS PART 1 TEXTBOOK FOR CLASS XI>Chapter 8 - Gravitation>EXERCISES>Q 8.17
A rocket is fired vertically with a speed of 5 km s-1 from the earth’s surface. How far from the earth does the rocket go before returning to the earth? Mass of the earth =6.0 × 1024 kg; mean radius of the earth=6.4 × 106 m; G = 6.67 × 10-11 Nm2kg-2.