02-13-2005, 01:38 PM
Minionman,Feb 12 2005, 07:01 PM Wrote:Nitpick, you mixed up newtons and kilograms. "newtons" should be the mass times gravity. Exactly. Good!
The atmosphere's effect is on the apparent weight of whatever gets weighed, so technically, if the scale says 10 N, you have to add your volume of air to get the real weight, and since feathers and lead have different densities, the volumes and weights will be different. This is usually a really small effect, and may or may not actually matter for this problem.
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Imagine weighing plumes and lead under water: because of the lifting force you may never actually be able to weigh one kg of plumes under water. Same goes (in reduced dimensions) for the atmosphere: if both of them are weighed on earth, the lifting force brings about that actually more than 1kg plumes and more that one kg lead are measured. But still more kg plumes than lead, let's say 1.00092 kg plumes actually, and 1.00007 kg lead actually. On the earth, they weigh both exactly the same. Since the moon 'atmosphere' is not so 'dense' than the earth atmosphere, though, the plumes are heavier (if just a little bit) than the lead now, and the scale will travel to the side of the plumes.
PS: Monica's father has five daughters: Lele, Lili, Lala, Lolo, and what's the name of his fifth daughter?
(ok that's far easier again :) )
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