- #1
LavaLynne
- 7
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I've got a homework question that I'm particularly stuck on:
Suppose that the halo, assumed spherical, of non-baryonic dark matter surrounding our galaxy has mass ~ 5 x10^12 M solar and radius 0.1 Mpc. What it its average density in Kg m-3?
I think that I need to use the formula M= r v^2/ G
G being the gravitational constant.
What I'm really unsure of is how to rework the formula?
I'm assuming that the average density will be the volume?
I've come up with v= M(r)/G and then square the answer
Am I anywhere close?
Thanks in advance!
Suppose that the halo, assumed spherical, of non-baryonic dark matter surrounding our galaxy has mass ~ 5 x10^12 M solar and radius 0.1 Mpc. What it its average density in Kg m-3?
I think that I need to use the formula M= r v^2/ G
G being the gravitational constant.
What I'm really unsure of is how to rework the formula?
I'm assuming that the average density will be the volume?
I've come up with v= M(r)/G and then square the answer
Am I anywhere close?
Thanks in advance!