courses:ast301:1
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| courses:ast301:1 [2024/02/19 01:30] – [3.2 Galaxy clusters] asad | courses:ast301:1 [2024/03/07 01:12] (current) – [4.2 Dynamical timescale] asad | ||
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| The time needed to fall by a distance $R$ is found from the constant-force expression $s=at^2/2$, i. e. the dynamical timescale | The time needed to fall by a distance $R$ is found from the constant-force expression $s=at^2/2$, i. e. the dynamical timescale | ||
| - | $$ \tau_{in} = \sqrt{\frac{R}{a}} = \sqrt{R^3}{GM} $$ | + | $$ \tau_{in} = \sqrt{\frac{R}{a}} = \sqrt{\frac{R^3}{GM}} $$ |
| where density $\rho=M/ | where density $\rho=M/ | ||
courses/ast301/1.1708331456.txt.gz · Last modified: by asad