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PHY 101 PHY 101 Past Questions Objective Question
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Question

An automobile tire is filled to a gauge pressure of 225 kPa at 25°C. After driving, temperature rises to 48°C. What is the pressure within the tire at 48°C?
Options
A 800 kPa
B 180.8 kPa
C 221.2 kPa
Correct Answer
D 50 kPa
Correct Answer

Option C is the correct answer.

Detailed Explanation

For constant volume, P1/T1 = P2/T2. Use absolute pressure and Kelvin. Gauge pressure is above atmospheric. Assume atmospheric = 101 kPa. Absolute P1 = 225+101=326 kPa. T1=25+273=298 K, T2=48+273=321 K. P2 = P1(T2/T1)=326(321/298)≈351 kPa absolute. Gauge = 351-101=250 kPa approximately. Closest option is 221.2 kPa (C).

Hint

Use ideal gas law at constant volume: P/T constant. Convert to absolute pressure and temperature.

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 206 of 1250
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