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A balloon filled with helium gas floats in a big closed jar which is connected to an evacuation pump. What will be your observation, if air from the jar is pumped out?A.
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How does a hot air balloon work: Buoyancy in gases - tec-science
A large balloon of mass 226 kg is filled with helium gas until its volume is 325 m^3. Assume the density of air is 1.29 kg/m^3 and the density of helium is
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A helium balloon floats at the end of a string. The net force (the buoyancy force minus the weight) on the balloon is 33N. If the tension in the string exceeds 54
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