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Maths & Physics Help
astarmathsandphysics:
--- Quote from: nid404 on April 22, 2009, 07:17:40 am ---The second part of the question needs help.
Q.The air in a bicycle tyre has a volume of 1000cm3 and a pressure of 2.5 atmospheres. If the air is released ( at the same temperature) so its pressure is 1 atmosphere, what is the volume of the air?
This part needs help
A bicycle has a volume of 100cm3 and is now used to pump up the tyre. After 1 stroke of the pump, what is the presure in the tyre?
Thanks
--- End quote ---
pV=constant so 2.5x1000=2500=pV=1xV so V=2500cm^3
The air had volume of 2500 at 1atmosphere but we put in an extra 100 so new volume at 1 atmosphere is 2600cm^3
pV=1X2600=px1000 so p=2.6 atmospheres.
hyebyekadal:
um..ur q is not quite clear so can you like say which paper? and year?
nid404:
--- Quote ---pV=constant so 2.5x1000=2500=pV=1xV so V=2500cm^3
The air had volume of 2500 at 1atmosphere but we put in an extra 100 so new volume at 1 atmosphere is 2600cm^3
pV=1X2600=px1000 so p=2.6 atmospheres.
--- End quote ---
I tried the same thing earlier but the answer to this question is 1.1 atmospheres. How do you derive that?
And this question was found in a physics textbook for IGCSE known as Physics For You by Keith Johnson. I don't know whether it was taken from any past paper.
anyways thanks for your help.
SGVaibhav:
do u have that book in a ebook?
astarmathsandphysics:
--- Quote from: nid404 on April 22, 2009, 09:56:51 am ---
--- Quote ---pV=constant so 2.5x1000=2500=pV=1xV so V=2500cm^3
The air had volume of 2500 at 1atmosphere but we put in an extra 100 so new volume at 1 atmosphere is 2600cm^3
pV=1X2600=px1000 so p=2.6 atmospheres.
--- End quote ---
I tried the same thing earlier but the answer to this question is 1.1 atmospheres. How do you derive that?
And this question was found in a physics textbook for IGCSE known as Physics For You by Keith Johnson. I don't know whether it was taken from any past paper.
anyways thanks for your help.
--- End quote ---
How can youn pump in 100cm^3 more air and have the pressure fall from 2.5 to 1 atmosphere?
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