BR Physics ch7 Q10 pg 95

[Mtrader]

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this is question 10 from passages II

A hot air ballon is used to lift a load, which of the following statements should be true?
T(in)=temp in ballon
T(out)=temp outside of ballon

A. T(in)=T(out): weight=buoyant force
B. T(in)>T(out): buoyant force exceeds weight
C. T(in)<T(out): weight exceeds buoyant force
D. T(in)>T(out): density of air inside exceed density of air outside.

if B is correct then how can C be incorrect? arent they exact opposites? The only thing i can think of it that by "wieght" the mean the load only making C not ALWAYS true when you consider the weight of the ballon itself.

That reason just doent seem right...i must be missing somthing.

 

[anon4895]

this is question 10 from passages II

A hot air ballon is used to lift a load, which of the following statements should be true?
T(in)=temp in ballon
T(out)=temp outside of ballon

A. T(in)=T(out): weight=buoyant force
B. T(in)>T(out): buoyant force exceeds weight
C. T(in)<T(out): weight exceeds buoyant force
D. T(in)>T(out): density of air inside exceed density of air outside.

if B is correct then how can C be incorrect? arent they exact opposites? The only thing i can think of it that by "wieght" the mean the load only making C not ALWAYS true when you consider the weight of the ballon itself.

That reason just doent seem right...i must be missing somthing.

I think they're asking which should be true if the balloon is lifting the load. C says the weight exceeds, the buoyant force... the balloon won't lift anything in that case.

 

[Mtrader]

I think they're asking which should be true if the balloon is lifting the load. C says the weight exceeds, the buoyant force... the balloon won't lift anything in that case.

Great Scott! i think you are right! Thank you!

semantics...my favorite reason to get questions incorrect.