Deriving the Value of an Exponent

1 reply · 3K views · last reply
UMich1344
Messages
26
Reaction score
0

Homework Statement



Suppose we lived in a matter-dominated, critical-density universe. The matter density rho of such a universe changes with time t as a power of t. Derive the value of the exponent n in the following equation:

Homework Equations



rho = At^n

where A = constant
 

Discussion

Similar threads

Deriving a value for Full Width Half Maximum
  • Emspak
  • · Replies 1 ·
  • Introductory Physics Homework Help
Replies
1
Deriving and Verifying the Relativity Formula for Electron Speed
  • Samkiwi
  • · Replies 2 ·
  • Introductory Physics Homework Help
Replies
2
Deriving an expression for change in internal energy
  • Krisd98
  • · Replies 5 ·
  • Introductory Physics Homework Help
Replies
5
Deriving ODEs for straight lines in polar coordinates for a given Lagrangian
  • Hamiltonian
  • · Replies 8 ·
  • Introductory Physics Homework Help
Replies
8
Why is dt/dx = 0 in deriving the law of reflection?
  • Fernando Rios
  • · Replies 3 ·
  • Introductory Physics Homework Help
Replies
3
Deriving the Thick Lens Equation: How to Obtain the Equations for a Thick Lens?
  • Arman777
  • · Replies 4 ·
  • Introductory Physics Homework Help
Replies
4
Deriving an equation for the velocity of a particle
  • LonelyElectron
  • · Replies 1 ·
  • Introductory Physics Homework Help
Replies
1
Graduate Deriving Dirac's Eq. (27.4) for momentum density variation in dust
  • Kostik
  • · Replies 50 ·
  • Special and General Relativity
2
Replies
50
Deriving the wave equation for a vibrating string
  • John004
  • · Replies 1 ·
  • Introductory Physics Homework Help
Replies
1
Deriving the Equation for Average Water Mass Flow Rate in Water Rocket Launches
  • PhysicsIBStudent
  • · Replies 12 ·
  • Introductory Physics Homework Help
Replies
12