And the balloon goes up. ... Perhaps a better way of visualizing the difference is to apply Archemedes Principle that a body (hot air) is buoyed up by a force equal to the volume of the displaced fluid (cold air) in contrast to a body (cold air) is buoyed up be a force equal to the volume of the displaced fluid (hot air).
www.newton.dep.anl.gov/askasci/phy00/phy00435.htm
This force was studied by the Greeks before 200 B.C. and can be understood by Archimedes' principle: any body completely or partially submerged in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the body. ... We need to consider the sum of the forces acting on the balloon,
imagine.gsfc.nasa.gov/docs/ask_astro/answers/970106a.ht... imagine.gsfc.nasa.gov/docs/ask_astro/answers/970106a.html
BUOYANT FORCE of WATER According to Archimedes' Principle, a mass immersed in water is buoyed up by a force equal to the weight of the water it displaces. Using a spring balance we can show that when a 200g mass is immersed in ... o Is there a force of attraction between the helium gas contained in the balloon and the earth?
www.crsep.org/PerplexingPairs/ArchimedesprinciplepartII... www.crsep.org/PerplexingPairs/ArchimedesprinciplepartII.020503.pdf
Buoyancy - Wikipedia, the free encyclopedia
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In physics, buoyancy (pronounced /ˈbɔɪ.ənsi/ ) is the upward force that keeps things afloat. The net upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the bod...
en.wikipedia.org/wiki/Buoyancy
Background: Archimedes' Principle states that a body immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced. In other words, a body immersed in a fluid seems to lose weight equal in amount to the weight of ... 3. Calculate the buoyant force of your balloon using the formula in step 1 above.
www.sciencebyjones.com/hot_air_balloon.htm www.sciencebyjones.com/hot_air_balloon.htm
Q. When an object is partly or wholly immersed in a liquid, it is buoyed up: His answer: By a force equal to the weight of liquid displaced. My answer: By a force equal to its own weight. It's its own weight! ... On the other hand, if the balloon feels an upward force equal to the weight of the water it displaces,
www.physicsforums.com/archive/index.php/t-17127.html
The buoyant force on a submerged rock is equal to its weight in the water. An immersed object is buoyed up by a force equal to the volume of the fluid it displaces. An object will sink in water if its density is greater ... A) The helium balloon B) The air balloon C) Neither -- they both experience the same buoyant force.
www.lenoxpublicschools.org/staff/mcote/physics/cp_physi... www.lenoxpublicschools.org/staff/mcote/physics/cp_physics/Handouts/Exam7Practice.pdf
(No explanation needed.) A balloon is buoyed up with a force equal to the ... weight of the balloon and its contents ... ; A - all objects have a buoyant force equal to the weight of the displaced fluid ;
www.physics.odu.edu/~weinstei/courses/102s04/sampletest... www.physics.odu.edu/~weinstei/courses/102s04/sampletests/Exam1Sample/Exam1SampleAnswers.html
10)  Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed will be  ... A) by a force equal to its own weight.
tigre.ucr.edu/dipen/phs1/Test1.htm
Eureka!: The lift of a balloon is determined by Archimedes' principle (also called the law of hydrostatics), which states that an object is buoyed up with a force equal to the weight of the fluid (gas or liquid) it displaces.
www.riverdeep.net/current/2002/06/060302t_balloons.jhtm... www.riverdeep.net/current/2002/06/060302t_balloons.jhtml