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What are artificial satellites? How are these satellites useful to us?

Important Questions on Gravitation

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Physics>Mechanics>Gravitation>Kepler's Laws
Kepler's third law states that the square of the period of revolution T of a planet around the sun is proportional to the third power of the average distance r between sun and planet i.e., T2=Kr3, here K is constant. If the masses of sun and planet are M and m respectively then as per Newton's law of gravitation force of attraction between them is F=GMmr2, here G is gravitational constant. The relation between G and K is described as:
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Physics>Mechanics>Gravitation>Kepler's Laws
An artificial satellite of mass m is moving along an elliptical path around the earth. The areal velocity of the satellite is proportional to
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Physics>Mechanics>Gravitation>Kepler's Laws
Write the general characteristics of Jovian planets.
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Physics>Mechanics>Gravitation>Kepler's Laws
The figure shows an elliptical path ABCD of a planet around the sun S such that the area of triangle CSA is 14 the area of the ellipse. (see figure) with DB as the major axis, and CA as the minor axis. If t1 is the time taken for the planet to go over path ABC and t2 for path taken over CDA then:

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Physics>Mechanics>Gravitation>Kepler's Laws
Write any two characteristics of Jovian Planets.
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Physics>Mechanics>Gravitation>Kepler's Laws

The earth takes 1 year to make a complete revolution around the sun whereas Pluto takes nearly 248 of our earth years to orbit the sun. What is the main reason for this?

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Physics>Mechanics>Gravitation>Kepler's Laws

Stars twinkle but, we do not see the twinkling of planets. Give reason.

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Physics>Mechanics>Gravitation>Kepler's Laws
What portion of the Moon do we see when it is between the Sun and the Earth?
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Physics>Mechanics>Gravitation>Kepler's Laws
Where does the Moon get its light from? 
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Physics>Mechanics>Gravitation>Kepler's Laws
Satellites send and receive _____(light/ signals).
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Physics>Mechanics>Gravitation>Kepler's Laws
What do you know about man-made satellites?
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Physics>Mechanics>Gravitation>Kepler's Laws
There is no water and air on the moon.
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Physics>Mechanics>Gravitation>Kepler's Laws
How many days does the moon take to go around the Earth? 
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Physics>Mechanics>Gravitation>Kepler's Laws
What do you know about the moon?
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Physics>Mechanics>Gravitation>Kepler's Laws
The New Moon shines brightly in the sky.
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Physics>Mechanics>Gravitation>Kepler's Laws
On which day do we see the Full Moon after the New Moon?
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Physics>Mechanics>Gravitation>Kepler's Laws
Why do you think there is no life on the moon?
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Physics>Mechanics>Gravitation>Kepler's Laws
The Moon takes approximately 4 weeks to go around the Earth.
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Physics>Mechanics>Gravitation>Kepler's Laws
When can we see the full moon?
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Physics>Mechanics>Gravitation>Kepler's Laws
The stars go away from the sky during the day.