-Z- (Z@Gundam.Com)
Fri, 26 May 2000 19:47:35 -0700


At 16:31 5/26/2000, you wrote:
>What's Earth's and Moon's escape velocity again?

Escape velocity isn't a factor here, because the object in question isn't
coming from outside the gravity well. It's being dropped from lunar orbit
(specifically, from L4) to Earth surface.

That's a total change in velocity (delta-V) of 12.7 km/sec (41,666.7 ft/sec).

Dropping a colony on the Moon from lunar orbit (L4) involves a total
delta-V of 2.2 km/sec (7,217.85 ft/sec).

As you can see, those values have an approximate ratio of 6:1 -- 5.7727:1,
to be precise -- reflecting the difference in gravity between the two bodies.

-Z-

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