Physics, 25.10.2019 22:43, razomike88
Agalaxy cluster contains n = 1000 galaxies within its half-mass radius of rh = 1.5 mpc. to the zeroth order, these galaxies are moving in random directions not unlike ideal gas particles. the three-dimensional mean square velocity of the cluster is σ = ^1/2 = 1000 km s^−1 . (a) what is the mean number density of galaxies within the half-mass radius? (b) suppose that the typical cross-sectional area of a galaxy is a = 10^−3 mpc^2 . how far will a galaxy in the cluster travel, on average, before it collides with another galaxy? (c) what is the average time between collisions for a galaxy in the cluster? how does this time compare with the hubble time?
Answers: 2
Physics, 21.06.2019 18:10, andrejr0330jr
How does the space charge width change with forward and reverse bias? also, calculate the space charge width for a reverse bias of 4v on a silicon pn junction at t = 300k and doping concentrations of na = 5x1015cm-3 , nd = 5x 1016 cm-3 .
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Agalaxy cluster contains n = 1000 galaxies within its half-mass radius of rh = 1.5 mpc. to the zerot...
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