PHY3101 - Some useful formulas Note: t0 is the elapsed time in the frame considered "stationary" and l0 is the length of an object at rest relative to the observer. Remember, however, that every inertial frame may be considered to be "stationary". =
1 (1-

Intermediate Modern Physics - Review Problems
Fall, 2009
1. A proton moving with = 0.99 will appear like a moving disk. (a) Compute the thickness of the disk assuming that in the protons rest frame the protons diameter is 1 fm. (b) Compute the protons kin

Hints on cosmology question
1. Friedman equation
8 G 2 a 3 This can be solved for the scale factor a(t), given the dependence of the energy density on the scale factor a(t). For example, for a universe dominated by matter, ( a ) = 0 / a 3 , a2 =
where 0 i

Intermediate Modern Physics - Review Problems
Fall, 2009
1. A proton moving with = 0.99 will appear like a moving disk. (a) Compute the thickness of the disk assuming that in the protons rest frame the protons diameter is 1 fm. (b) Compute the protons kin