The four tires of an automobile are inflated to a gauge pressure of 1.7 105 Pa. Each tire has an area of 0.020 m2 in contact with the ground. Determine the weight of the automobile.
P = F/A
F = P * A
where F = weight P = Pressure A = Area
As the atmospheric pressure inside and outside of tires acts equally, So we take gauge pressure for P
A = 4 * 0.020 m^2 = 0.08 m^2 total area
P = 1.7x10^5 Pa
F = weight of car = P * A
= 1.7x10^5 * 0.08
= 13,600 N
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