20. AB diameter the of circle with center o coordinates of A are (8,-4) and -B (-8,4) find the
center of circle and also radius of circle.
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Answer:
Pressure is the amount of force acting per unit area. That is, P=F/A.
where:
p is the pressure,
F is the normal force,
A is the area of the surface on contact. Let us consider A = πr
2
.
Therefore,
πr
1
2
F
1
=
πr
2
2
F
2
.
In this case,
20
2
1500
=
1
2
W
,W=3.75kg.
Hence, weight to be placed on the small piston sufficient to lift a car of mass 1500 kg is 3.75 kg.
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