Question

The manual of a car instructs the owner to inflate
the tyres to a pressure of 200 kPa. (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 be
the tyre gauge read ? Atmospehric pressure
= 1.01 X 109 Pa.​

Answer 1

Answer:

Atmospehric pressure =1.01×105Pa. or P=Pa+PG=101kPa+200kPa=301kPa (c ) At the mountain peak, the atmospheric pressure Pa= is 10% less, So Pa′90100×101kPa=90.9kPa Assuming that the absolute pressure in the tyres has not changed during the drive, then PG=P-Pa=301-90.9=210.1kPa Thus tyre gauge reads pressure as 210.1 kPa.