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An empty pressure cooker of volume 10 littee contains air at atmospheric pressure 10^5 pascal and temp of 27°C.It contains a whistle which has area of 0.1 cm^2 and weight of 100 gn .what should be temp of air inside so that the whistle is just lifted up.

An empty pressure cooker of volume 10 littee contains air at atmospheric pressure 10^5 pascal and temp of 27°C.It contains a whistle which has area of 0.1 cm^2 and weight of 100 gn .what should be temp of air inside so that the whistle is just lifted up. 

Grade:12th pass

1 Answers

Arun
25763 Points
one year ago
 
Pressure by whistle = Po + F / A = Po​ + mg/ A
= 105Pa + (0.1 * 10 N) / (0.1 * 104 m2)
= 2 * 105 Pa
Pressure inside cooker = 105Pa
for whistle to just lift, by gay lussacs law
Pwhistle / Tsurrounding = Pcooker / Tcooker
(2 * 105 Pa) / 300 K = 105 Pa / T
T = 600 K = 327oC

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