The four tires of an automobile are inflated to a gauge pressure of 1.7 105 Pa.

Physics
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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.

 N
Jun 11th, 2015

Hi !

As 

P = F/A

From this

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

then

A = 4 * 0.020 m^2 = 0.08 m^2 total area

P = 1.7x10^5 Pa

So

F = weight of car = P * A 

                            = 1.7x10^5 * 0.08

                            = 13,600 N

Hope you get it. Thanks :)
Jun 11th, 2015

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