# College Physics- buoyancy problem

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass of approximately 70 kg, the radius of a balloon is 12.5 cm, the helium is at STP and it is immersed in air at 0°C and 1 atm.

I used the equation for buoyant force to find the buoyant force of one balloon. The equation is Buoyant force= (density of air)*(acceleration due to gravity)*(Volume displaced)

The weight of the person is 686/buoyant force of one one balloon= # of balloons.

I got 6710 balloons, but this is incorrect.

1. 👍 0
2. 👎 0
3. 👁 137
1. But you left out the weight of the Helium

At stp a mole of Helium is 22.4 liters
and a mole of He is 4 grams / mol

1. 👍 0
2. 👎 0
posted by Damon
2. I included the weight of helium, (which is minuscule) and it still did not work.

1. 👍 0
2. 👎 0
3. Just as an update, I did include the weight of the helium, but I did it incorrectly. Thanks for making me check it again. Really, I am truly grateful. THANKS DAMON.

1. 👍 0
2. 👎 0
4. You are welcome :)

1. 👍 0
2. 👎 0
posted by Damon

## Similar Questions

1. ### Physics

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass

asked by Student who needs help on November 22, 2015
2. ### Physics

On October 21, 2001, Ian Ashpole of the United Kingdom achieved a record altitude of 3.35 km (11,000 ft) powered by 600 toy balloons filled with helium. Each filled balloon had a radius of about 0.45 m and an estimated mass of

asked by Paah Rich on May 2, 2019
3. ### ap chemistry

A 1.50 liter tank filled with helium at 125 atm is used to fill balloons. The pressure in each balloon is 950 torr and the volume of each balloon is 1.20 liters. How many balloons can be filled? Answer in units of balloons

asked by cheri on February 9, 2013
4. ### math

Caitlyn bought a helium tank to fill spherical balloons for a party. If the diameter of the filled balloons are 14.4 inches, how much helium would be needed in each balloon?

asked by Anonymous on February 4, 2015
5. ### history

1. What is allocation by need? (1 point) pricing goods based on want rather than need giving or selling goods only to people who most need them giving or selling goods to whoever will stand in line the longest pricing goods so

6. ### Chemistry

What is the maximum weight (in grams) that 15 party balloons, each filled with 2 L of helium, can lift at STP? You can assume the weight of the balloon rubber is negligible and the outside air can be treated as pure nitrogen.

asked by Erika on October 17, 2010
7. ### chemistry- thank you

What is the maximum weight (in grams) that 15 party balloons, each filled with 2 L of helium, can lift at STP? You can assume the weight of the balloon rubber is negligible and the outside air can be treated as pure nitrogen.

asked by Anthony on October 31, 2010
8. ### Chemistry

A cylinder containing 15.0 L of helium gas at a pressure of 165 atm is to be used to fill party balloons. Each balloon must be filled to a volume of 2.0 L at a pressure of 1.1 atm. What is the maximum number of balloons that can

asked by Aaqib Zaman on November 15, 2014
9. ### Physics

You want to design a helium-filled balloon that will lift a total payload of 1225 kg. What volume of helium is needed to just barely lift this payload?

asked by Sierra on July 25, 2012
10. ### physics

A portable steel tank with a volume 35 liters (0.035m³) holds helium gas used for filling party balloons. The pressure in the tank is 120atm when at room temperature of 22 °C. How many moles of helium gas are in the tank? Each

asked by sand on January 4, 2012

More Similar Questions