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Answer on Mechanics | Relativity Question for Deandre

Question #7055
The four tires of an automobile are inflated to an absolute pressure of 2.00 x 105 Pa. Each tire has an area of 0.0240 m2 in contact with the ground. Determine the weight and mass of the automobile
Expert's answer
As it follows from the third Newton's law, the gravity force is equal in magnitude to the pressure force that acts on the tires. The pressure force is
F = P*S = 2.00 x 10^5 * 0.0240 = 4800 N.
So, the weight of an automobile is 4800N and it's mass (according to the second Newton's law) is M = 4800/g = 4800/9.8 ≈ 489.7959 kg.

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