Physics question

**Chunder** · 23 Apr 09,, 11:47

Originally Posted by Parihaka

And there it is, thanks Dale.

R = 9.81g/(((pi x rpm)/30)^2)

I Don't get it.

G is gravity. 9.81 is 1G. so why are your timesing gravity by gravity...

pi x rpm = radians or w....

net effect I still get r x w = v.

which should come out as the same answer above.

*sigh*...

edit stuff it im going back to the winch.

**Parihaka** · 23 Apr 09,, 12:04

Originally Posted by Chunder

I Don't get it.

G is gravity. 9.81 is 1G. so why are your timesing gravity by gravity...

pi x rpm = radians or w....

net effect I still get r x w = v.

which should come out as the same answer above.

*sigh*...

edit stuff it im going back to the winch.

Sorry,
g = Decimal fraction of Earth gravity (i.e. the level of g you want to create)
R = Radius from center of rotation in meters
π = 3.14159
rpm = revolutions per minute

roughly 1,850,000km radius.

Bugger, that's a big number....

**dalem** · 23 Apr 09,, 18:29

Yeah. I'm no engineer, Pari, but I'd suggest you spin it faster.

-dale

**Parihaka** · 23 Apr 09,, 19:43

Originally Posted by dalem

Yeah. I'm no engineer, Pari, but I'd suggest you spin it faster.

-dale

Yeah I was just hoping for the natural cycle but the size of the thing doesn't suit the scenario

**ArmchairGeneral** · 23 Apr 09,, 19:48

Originally Posted by dalem

It's the centripetal force you're actually concerned with, Pari.

I don't have an exact formula to get you to the "g"s, but I do have some links to some related fun stuff that can help:

XKCD cartoon.

One of my favorite XKCDs.