The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27^\circC. Hard driving in the afternoon raised the temperature of the tyres to 57^\circC. The tyre pressure had by the afternoon was?
A
increased by 15.0cm Hg
B
decreased by 15.0cm Hg
C
increased by 22.50cm
D
decreased by 22.50cm Hg
E
remained constant
Verified Correct Answer: A.
Physical Principles & Numerical Solution
\(\frac{P_1}{T_1}\) = \(\frac{P_2}{T_2}\) at constant volume
\(\frac{150}{27 + 273}\) = \(\frac{P_1}{57 + 273}\)
P2 = 165cmHg
Source: Myschool Past Questions Archive (Record #28893)