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Author Question: Explain in terms of buoyant force how a fish is able to rise and sink in water. Contrast this to the ... (Read 76 times)

londonang

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on: Jul 29, 2018
Explain in terms of buoyant force how a fish is able to rise and sink in water. Contrast this to the way a submarine rises and sinks.
 
  What will be an ideal response?

Question 2

Why will a helium-filled balloon rise in air while an air-filled balloon sinks?
 
  What will be an ideal response?


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todom5090

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Saved me massive time.

Answer to Question 2

Answer: Both balloons displace air and have a buoyant force that depends on their volumes. If buoyancy were the only force acting, they both would rise. But there's weight. The air-filled balloon is simply heavier than the air it displaces, thus its weight is greater than the buoyant force, and it sinks. It is heavier because the stretched balloon fabric compresses the air within. Likewise for the helium, but it is so low in density that even when compressed it is still lighter than the air it displaces.


londonang

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Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

kilada

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Reply 3 on: Yesterday
Excellent

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