Astronomers use the AU for measuring distances throughout the solar system. Jupiter, for example, is 5.2 AU from the sun. Neptune is 30.07 AU from the sun. On the outer edges of the solar system, the Oort Cloud, where comets are thought to originate, is 100,000 AU from the sun. The distance to the nearest star, Proxima Centauri, is about 250,000 AU. However, to measure longer distances, astronomers use light-years, or the distance that light travelsin a single Earth year, which is equal to 63,239 AU. So Proxima Centauri is about 4.2 light-years away.
when the system is at rest tension= weight of the body=mg
so, t1=5*10=50,likewise t2=20 and t3=30(unit=n)
when the system is acclerated upwards a pseudo force acts on the body downwards so,tension=mg+ma
t1=5*10+5*2=60n,likewise t2=24n and t3=36n
iris are red objects in our eyes the eyes to keep them wet