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Mass of the earth ………………………….....

Mass of the earth …………………………..

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`5.972xx10^(24) kg`
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As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth’s gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = 6.0 xx 10^(24) kg." radius" = 6400 km .

The earth revolves round the sun due to gravitatinal attraction. Suppose that the sun and the earth are point particle with their existing masses and that Bhor's quantization rule for angular monentum is valid in the case of gravitation (a) Calculate the minimum radius the earth can have for its orbit. (b) What is the value of the principle quantum number n for the present radius ? Mass of the earth = 6.0 xx 10^(24) kg, mass of the sun = 2.0 xx 10^(30) kg, earth-sun distance = 1.5 xx 10^(11)m .

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 x× 10^(24) kg, mean radius of the earth = 6.4 xx 10^(6) m , G = 6.67 xx 10^(-11) " N "m^(2) kg^(-2) .

(i) Define orbital velocity and establish an expression for it. (ii) Calculate the value of orbital velocity for an artifical satellite of earth orbiting at a height of 1000km (Mass of the earth =6xx10^(24)kg , radius of the earth =6400km ).

A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite = 200 kg, mass of the earth = 6.0 ×x 10^(24) kg, radius of the earth = 6.4 xx 10^(6) m , G = 6.67 xx 10^(-11) N m^(2)) kg^(-2) .

A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero ? Mass of the sun = 2 xx 10^(30) kg. Mass of the earth = 6xx10^(24) kg. Neglect the effect of other planets etc. (orbittal radtus = 1.5 xx 10^(11) m ).

A satellite orbits the earth at a height of 500km from its surface. Mass of the earth =6xx10^(24)kg Radius of the earth =6.4xx10^(6)m Mass of the satellite = 300kg G=6.67xx10^(-11)Nm^(2)kg^(-2) Calculate (i) kinetic energy (ii) potential energy and (iii) total energy of the satellite.

A rocket is fired from the earth. The body is projected the distance between the earth of the moon is r & the mass of the earth is 81 times the mass of the moon. The gravitational force on the rocket will be zero, when its from the moon is

Escape velocity: V_(esc) = sqrt((2GM)/(R)) for earth : V_(esc) = 11.2 km//s If mass of a planet is eight times the mass of the earth and its radius is twice the radius of the earth , what will be the escape velocity for that planet ?

FULL MARKS-LAWS OF MOTION-Additional Questions (II. Fill in the blanks)
  1. Turning a tap is an example for ………………………

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  2. Torque is a quantity .

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  3. 1 gf is equal to ……………………… dyne.

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  4. The resultant force acting on a body is equal to zero then the body wi...

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  5. The force which is equal to resultant but opposite in direction is c...

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  6. The product of force and time is ………………………

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  7. Force between the masses is always ………………………

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  8. The quantity of matter contained in the object is known as ………………………

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  9. Magnitude of universal gravitational constant is ………………………

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  10. Propulsion of rockets is based on the ……………………… and ………………………

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  11. Parallel unequal forces are acting in ……………………… directions.

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  12. Torque and force are the ……………………… quantities.

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  13. The unit of moment of a couple is ………………………

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  14. A ……………………… enables you to manoeuore a car easily by transferring a ……...

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  15. ………………………….. is required to produce the acceleration of a body.

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  16. The acceleration is produced along the radius is called as …………………………....

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  17. ………………………….. is equal to the magnitude of change in momentum.

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  18. A large force acting for a very short interval of time is called as ……...

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  19. Mass of the earth …………………………..

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  20. Relation between acceleration due to gravity (g) and the universal gra...

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