Question

An empty pressure cooker of volume 10 litres contains air at temperature vof 27°C.It contains a whistle which has area of 0.1cm^2 and weight of 100 g.What should be the temperature of air inside so that whistle is just lifted up?

Answer 1

Answer:

let the temperature of the air inside the Vista just lift up Be X

Answer 2

GIVEN:

An empty pressure cooker of volume 10 litres contains air at temperature 27°C

.It contains a whistle which has area of 0.1cm^2 and weight of 100 g.

TO FIND :

What should be the temperature of air inside so that whistle is just lifted up?

SOLUTION :

◆Pressure to lift whistle,

P' = P + f / a

= P​ + mg / a

As, P - atmospheric pressure, 10^5

F - force, a- area

= 10^5Pa + {0.1 × 10 N} / (0.1 × 10^4 m2)

◆P'= 2 × 10^5 Pa.

◆For whistle to just lift,

Pw / Ts = Pc / Tc

(2 × 10^5 Pa) / 300 K = 10^5 Pa / Tc

◆Temperature in cooker,

Tc = 600 K = 600 -273 = 327℃.

ANSWER:

Temperature inside cooker should be = 327℃