Wednesday, 14 November 2012

galaxy - Using Tully Fisher to measure Distance Problem

Can anyone explain by looking at the solution in the pic, how did the cos (i) came about?
I guess they are getting this from the major-minor axis info in the question, but I am not sure about the derivation.



Also v=300/sin(i), what is this formula?



Many thanks :)



enter image description here

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