Question 2 :
The evidence to show that there must be force acting on Earth and directed towards the Sun is.
Question 3 :
If the distance between the earth and sun were to be doubled from its present value, the number of days in a year would be :
Question 4 :
A satellite is revolving around the earth in an elliptical orbit. Its speed will be<br>
Question 6 :
A satellite is orbiting around the earth. Then, the plane of the orbit:
Question 7 :
If the earth shrinks to half of its radius without changing its mass, the duration of the day will be
Question 9 :
Motion of planets in solar system is an example of conservation of :
Question 10 :
Planets rotate around the Sun in a path best described as <br/>
Question 11 :
Which of the following quantities remain constant in a planetary motion, when seen from the surface of the sun?<br>
Question 12 :
The ratio of critical speeds of two satellite if the ratio period is $ 3\sqrt {3} : 1 $ is
Question 13 :
Whose precise observations and records of the positions of the planets were very important to Johannes Kepler, in enabling him to formulate his laws of planetary motion?
Question 16 :
Keplers second law regarding constancy of aerial velocity of a planet is a consequence of the law of conservation of:<br/>
Question 17 :
When Johannes Kepler developed his laws for the movement of planetary bodies, one of the laws stated that the orbits of the planets about the sun are:
Question 20 :
Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane.<br/>Of the two, the planet that is farther from the star must have a:
Question 21 :
The distance of two planets from the Sun are $10^{13}$ and $10^{12}$m, respectively. The ratio of time periods of these two planets is?
Question 22 :
The radius vector drawn from the sun to a planet sweeps out ________ areas in equal time.<br>
Question 23 :
Which of the following statements corresponds to Kepler's laws of planetary motion?
Question 24 :
If the area swept by the line joining the sun and the earth from Feb 1 to Feb 7 is A, then the area swept by the radius vector from Feb 8 to Feb 28 is<br>
Question 25 :
If the earth is at one-fourth of its present distance from the sun, the duration of the year would be:<br/>