My weight is 52 kg.
2006-11-25 11:34:54 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The way to solve this:
1 Estimate your volume. You probably float in a swimming pool, but not by much. Whatever your mass is, you displace that mass of water when you float. From the density of water, that mass of water, m, has a volume of
V = m * (1 m^3) / 1000 kg
So V is a bit less than your volume, assuming that you float with your head above the water. So figure that your volume is 1.1*V.
2 Find the mass of 1.1*V of air. From the density of air, the mass of that volume is
Mair = 1.1V * (1.3 kg) / 1 m^3
For the bouyant force of the air on you, F = Mair*g.
2006-11-25 12:03:11 · answer #1 · answered by sojsail 7 · 2⤊ 0⤋
I cannot answer this question with the information given. Also, the weight of 52 kg is not needed to calculate the answer.
In order to calculate the answer, the two missing pieces of data are: (1) the volume of your body (in cubic feet, for example), and (2) the density of the air where you are located.
Once those data are known, calculate the weight of the volume of air displaced by your body by first finding out (perhaps via a local weather bureau) the density of the air at your elevation/location (this varies slightly depending on the local atmospheric pressure at the moment), multiply that number by the volume of your body, to get weight of that volume of air. This weight equals the buoyant force of the atmosphere on your body; the difference between what your weight would be if there were no air on the earth, and what it is with the air present. This is a very small amount of force/weight.
2006-11-25 19:49:47 · answer #2 · answered by JackN 3 · 1⤊ 0⤋
JackN is correct and deserves the vote for the best answer, however I will give a slightly different explanation that may help you to understand why.
Your body and the air are competing to get close to the mass of the earth. Your body wins this competition because it is more dens than the air (i.e. your body has more mass per unit volume). However, the volume of air that your body is displacing, uses its mass to oppose the pull of gravity on your body. Since the mass of the air your body displaces is so small, the force of buoyancy is neglegible.
2006-11-25 20:00:44 · answer #3 · answered by Mez 6 · 1⤊ 0⤋
There is not a bouyant force, but there is gravity working in the opposite direction.
2006-11-25 19:38:04 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Your good mood.
2006-11-25 19:43:06 · answer #5 · answered by Dr. Obvious 4 · 0⤊ 1⤋