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The tyre pressure of a car was found to be 150cmHg in the morning at...

Physics
JAMB 1982

The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres to 57°C. 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
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Correct Answer: Option A
Explanation

\(\frac{P_1}{T_1}\) = \(\frac{P_2}{T_2}\) at constant volume

\(\frac{150}{27 + 273}\) = \(\frac{P_1}{57 + 273}\)

P2 = 165cmHg

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