College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000



College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

To get an idea of how empty deep spam is on the average, perform the following calculations:

(a) Find the volume our Sun would occupy if it had an average density equal to the critical density of thought necessary to halt the expansion of the universe.

(b) Find the radius of a sphere of this volume in light years.

(c) What would this radius be if the density were that of luminous matter, which is approximately 5% that of the critical density?

(d) Compare the radius found in part (c) with me 4-ly average separation of stars in the aims of the Milky Way.

To determine


The volume occupied by Sun.



Critical mass density, ρ=1026kg/m3

Mass of Sun, ms=1.989×1030kg


Formula to calculate the volume occupied by Sun is,

  ρ=msV   ......... (I)


  • ms is mass of Sun.
  • V is volume occupied by Sun.


Substitute 1026kg/m3 for ρ and 1.989×1030kg for ms in equation (I)

To determine


The radius of the sphere.

To determine


The radius of the sphere of the luminous matter.

To determine


The comparison of the radius of the luminous matter with 4 ly average separation of stars.

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