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The manual of a car instructs the owner to inflate the tyres to a pressure of 200 k pa. (a) What is the recommended gauge pressure ? (b) What is the recommended absolute pressure (c) if, after the required inflation of the tyres, the car is driven to a mountain peak where the atmospheric pressure is 10% below that at sea level, what will the tyre gauge read ? |
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Answer» (a) Pressure Instructed by manual = Pg = 200 K Pa (b) Absolute Pressure = 101 k Pa + 200 k Pa = 301 k Pa (c) At mountain Peak Pa′ is 10% less Pa′ = 90 k Pa If we assume absolute pressure in tyre does not change during driving then Pg = P – Pa′ = 301 – 90 = 211 k Pa So the tyre will read 211 k Pa, pressure. |
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