Kepler laws

By
KEPLER'S LAWS OF PLANETARY MOTION

Kepler I law: 
    
           Every planet revolves around the sun in an elliptical orbit with the sun is at one of its foci. This law is also known as the law of Orbits.

Kepler II law: 

           The radius vector drawn from the sun to the planet gives equal areas in equal interval of time. That means the rate of change of the area of the planet / areal velocity is constant. This law is also known as the law of areas.


Kepler III law: 

          The time period (T) of the planet revolving around the sun is directly proportional to the cube of the semi-major axis (a) of the orbit. This law is also known as the law of periods.
                             i.e    T2 α a3

       

           

Comments

Post a Comment

Popular posts from this blog

Hydrogen is in abundance around the sun

By
Hydrogen is in abundance around the sun but not around earth. Why?     ANSWER:     The escape velocity on the sun is very high compared to that on the earth. The gravitational pull of the sun is very large because of its larger mass compared to that of the earth. So it is very difficult for hydrogen to escape from the sun's atmosphere because r.m.s velocity of hydrogen is more than escape velocity(11.2 km/sec). But on the sun r.m.s velocity of the hydrogen is less than the escape velocity of the sun. Hence hydrogen is abundant on sun. Note:  r.m.s velocity means root mean square velocity) escape velocity of the planet/star is the minimum velocity required to a body to escape form the planet/star.
Read more

Questions on Electric charges and fields

By
  EVOLUTION QUESTIONS AND ANSWERS Question:  In damped weather, automobile ignition failure happens. Give the reason? Answer:  Generally, the spark plug's surface accumulates a film of dirt. The surface dirt hygroscopic hence attracts moisture from the air. Therefore, in humid weather, plugs become quasi-conductor.  So ignition failure happens. Question: Why a charged body can attract a piece of paper? Answer: A piece of paper is a dielectric. When a positively charged body is brought near to piece of paper, atoms of paper get polarized (In the neutral body, charge separation as + and -) with the center of opposite charge of atoms coming closer to the charged body. So the charged body can attract a piece of paper. Question: A charged body can attract another uncharged body? Explain why? Answer: Yes, because when a charged body is brought very near to an uncharged body, an opposite induced charge will develop across the uncharged body. The therefore charged
Read more