Question
Question 30 of 30 Which of the following options best explains why the pressure in a car's tyres was found to be higher after a long journey than if was at the start of the journey? Enter your answer as a number 1 Some of the air in the tyres has escaped during the journey 2 The tyres have a greater volume at the end of the journey 3 The fyres are more worn at the end of the journey 4 The fyres are warmer at the end of the journey
Answer
4.2
(200 Votes)
Rosamund
Professional · Tutor for 6 years
Answer
4
Explanation
The question is asking us to find the best explanation for observed increase in pressure in a car tyre after a long journey.Option 1 and 3 describe instances where air escapes the tyre; however, this would likely reduce the pressure, not increase it. Option 2 suggests a larger volume after travel, which according to the ideal gas law (PV=nRT), where pressure and volume have a directly proportional relationship at constant temperature and amount of gas, increasing the volume would actually decrease the pressure. So option 2 is also not an effective explanation. In option 4, being warmer suggests a greater internal energy within the tyre. Heat accelerates the motion of atoms and subsequently results in increased pressure from the gas molecules. This option corresponds precisely to Charles's law in ideal gas law, which states volume is directly proportional to temperature; here without volume change, increase of temperature leads to rising pressure. So, this accurately explains why pressure in the tyre increases with the rising temperature as the journey progresses.