If it was eight hours from sun set to sunset how much would a 100 lb. person weigh at the equator?

Answer 1

Mike1942 is totally wrong and has massively overestimated the effect of rotation.

The rotational speed at the equator is very roughly 1000mph, or 446 metres per second. For a 100 kg person weighing 1000 Newtons, this means there is a reduction in apparent weight of about 3 Newtons or 0.3%. (F = mv^2/r = 100*447*447/6378000).

If you treble the speed this would increase from 0.3% to 0.9%.

For a 100lb person this would mean they would apparently weigh 99.4 lb (because the original weight presumably already contained the effect of the normal rotation speed).

Answer 2

I'm thinking they would weigh 1\3 there weight. But it depends. Is earth spinning faster for the 8 hrs sun rise\set. Or is it another planet or moon? Hummmmm.... Interesting. AND yes if the world was spinning faster we would weigh more. Or fly off into outer space.. Ever been on a merry go round?

Answer 3

You mean if the earth rotated 3 times as fast, what would be the change in the centifugal force trying to fling the person off?
Current speed is 1000 mph (approx) so new speed would be 3000 mph . Orbital speed at Zero altitude is 7.90 km/s or 17 671 (miles / hour) so person would lose about 1/6 their weight or be about 83
http://www.faqs.org/docs/Newtonian/Newtonian_202.htm

Answer 4

just read an artical in pop sci that said that gravity is different in different places. it all depends on basiccaly how much stuff is underneath you at the moment. mountains, sea, etc...

Answer 5

100lb. Just because the earth is spinning faster doesn't mean there's any more or less gravity. Gravity is determined by mass, not angular momentum.

Answer 6

100lb......?