2006-07-25 11:29:12 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Depends on the size and lifting ability of your balloon, now doesn't it? You've seen a picture of those big hot air balloons -- in which ONE balloon lifts a crew of two people.
2006-07-25 13:08:36 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Mythbusters did a show on that once but it was a child. About 2700 helium balloons were needed to lift a child 20kg child off the ground but only a few centimeters. I guessing if you multiply by 10 that would be the amount of balloons needed to lift a 165 pound man of the the ground.
2006-07-25 11:39:04 · answer #2 · answered by Gemini23 4 · 0⤊ 0⤋
A normal balloon might be 30 cm (about 1 foot) in diameter. To determine how many liters of helium a sphere can hold, the equation is 4/3*pi*r*r*r. The radius of a 30-centimeter-diameter balloon is 15 centimeters, So
4/3 * pi * 15 * 15 * 15 = 14,137 cubic centimeters = 14 liters
Helium has a lifting force of 1 gram per liter.
Each 30 cm balloon has 14 gm lifting force.
165 pound = 74.8427411 kilograms
74.8*1000/14 = You need 5345.9 Balloons
2006-07-25 11:51:52 · answer #3 · answered by sheikh 1 · 0⤊ 0⤋
What I want to know is... How many balloons does it take to lift a 86 pound person off the ground?
2006-07-26 06:47:13 · answer #4 · answered by LostxnxClueless 3 · 0⤊ 0⤋
Mythbusters did that and it took hundreds of balloons just to get a 40 pound kid off the ground. 55 weather balloons for a man. ($2000.00 of helium)
2006-07-25 11:38:40 · answer #5 · answered by Rockvillerich 5 · 0⤊ 0⤋
I saw this on Mythbusters once, they used 55 helium filled weather balloons to lift a guy off the ground
http://www.adamsavage.com/tvshow.html
2006-07-25 11:36:57 · answer #6 · answered by ♪ ♫ ☮ NYbron ☮ ♪ ♫ 6 · 0⤊ 0⤋
And then what?You're 50 feet off the ground and ascending!
2006-07-25 11:39:56 · answer #7 · answered by Balthor 5 · 0⤊ 0⤋
1 if it's big enough
2006-07-25 11:35:41 · answer #8 · answered by tjc 2 · 0⤊ 0⤋