Astronomy

1 ) Kepler s three lawsFirst lawThe orbits of the planets are in the shape of ellipses , with the sunbathe (or other star ) at ace focus of the ellipse Second lawThere is an imaginary line (a radius vector association planet to Sun ) which sweeps out correspond areas in agree times Third lawThe square of the period of orbit , dual-lane up by the cube of the radius of the orbit , is commensurate to a constant for that planet being orbited 2 ) galactic building block (AU , the Light Year (LY , and the Parsec (pcAn astronomic unit (A .U ) is the modal(a) distance amid the mankind and the Sun , which is about cl million kilometers The light year is the distance that light endure in in one year (365 1 /4 eld A parsec is the length of the long thole of a right triangle , whose short leg is one astronomical unit when the angle between the Sun and the Earth , as seen from an object in space (a star for pillow slip , is one arcsecond bound AU in ass of kilometres1A .U 0km Define light year in terms of AU The swiftness of light is about 300000 kilometres per second , hence 1 LY 300000 tt 60 60 24 365 ,25 sec 1 LY 300000 00 km 1 LY 00 /0A .U 63115 .2 A .U Define parsec in terms of light yearsaccording to the figure above : 1ps 1 / viciousness ) A .U is sm every(prenominal) then sin ( in rad 1arcsecond 1 /3600 of a degree (1 /3600 (2 /360 ) radian 4 .8481368e-6 radian1ps 1 / A .

U 206265 A .U 206265 /63115 .2 LY 3 .26 LY 3 ) justify what would happen to a planet s motion if short all gravitational indexs ceased to go . Relate your explanation to ! Newton s foremost and 2nd justices If suddenly all gravitational forces ceased to exist , the planets pass on stop revolving somewhat their stars and , according to Newton s 1st equity start lamentable uniformly and linearly 4 ) res publica Newton s justice of Universal gravitation Newton s Law of Gravitation states that the force of gravity between two particles of wad and has a order of magnitude of , where r is the distance between the centre of the two tidy sum and G is the gravitational constant : G 6 .67 10-11 N m2 /kg2 Reference Ridpath , Ian (1997 . lexicon of . Oxford : Oxford University Press...If you want to get a mount essay, order it on our website: OrderEssay.net

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