Acluster of galaxies has a radius of about 4.8 million light-years (4.5×1022 m ) and an intracluster medium with a temperature of 6.0×107 k . [hint: consult mathematical insight 23.3.]
1) estimate the mass of the cluster. give your answer in both kilograms and solar masses. suppose the combined luminosity of all the stars in the cluster is 7.5×1012 lsun .
express your answer using two significant figures.
m=
2) express your answer using two significant figures.
m=
3) what is the cluster's mass-to-light ratio?
express your answer using two significant figures.