the pressure in each of the four tyre of a car is 1.5*10^4 kgf/m^2 while each tyre has area of contact 25*10^-4 m^2 find the weight of the car
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Answer:
Area of contact of each tyre =10cm
2
Area of contact of two tyres (A)
=2×10cm
2
=20cm
2
=20×10
−4
m
2
(∴1cm
2
=10
−4
m
2
)
Pressure(P)=2bar=2×10
5
Pa(∴1bar=10
5
Pa)
Weight of the person=pressure×area
W=P×A=2×10
5
×20×10
−4
=400N
Weight of the person is 400 N.
Mass of the person (m)
=
g
W
=
10
400
=40kg
Therefore, the mass of the person is 40 kg.
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