HawKins PreSSure Cooker...!

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An empty pressure cooker (Volume=10 lts) contains air at atm. pressure 10⁵ Pa at a Temp. of 27⁰C. It contains a whistle with area 0.1cm² & mass=100gm.

What should be the Temperature of air inside so tht the whistle is just lifted up ?

a)400⁰C
b)600⁰C
c)327⁰C
d)227⁰C

#Physics #Thermal physics

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5 Answers

virang1 Jhaveri ·2009-12-19 08:34:26

See volume is constant
Therefore apply
P1/T1= P2/T2

P2*0.1*10^-4=1N
P2= 10⁵

Therefore a,b,c,d

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Avik ·2009-12-20 05:05:16

Ans c) diya hai....

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Subhomoy Bakshi ·2009-12-20 05:14:02

P₁=10⁵Pa
P₂=P₁+mg/area=0.1*10/(0.1*10^-4)=2*10⁵

P₁V/T₁=P₂V/T₂
or T₂=P₂T₁/P₁=2*1o⁵*300/10⁵=600K
t₂=327Â°C

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Subhomoy Bakshi ·2009-12-20 05:14:57

so answer is c) only

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Avik ·2009-12-20 05:29:27

Isn't tht 10⁵ ,the pressure of gas inside the cooker ?

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