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|Partho Pratim Mitra|
Three identical cars A, B and C are moving at the same speed on three bridges. The car A goes on a plane bridge, B on a bridge convex upward and C goes on a bridge concave upward. Let F1, F2 and F3 be the normal forces exerted by the cars A,B and C respectively on the bridges when they are at the middle of bridge.
a) F1 Is maximum of the three forces
b) F2 is maximum of the three forces
c F3 is maximum of the three forces
d) F1= F2 = F3
What is the answer of the above question? What is the meaning of “normal forces exerted by the cars on the bridges” mentioned in the question? Is it normal reaction or weight?
Please explain option ‘c’ and ‘d’ in detail.
In Q. No.5 in exercise 13.1 of NCERT book,if they hav told to find the total surface area of the remaining solid ,then why dont we add the bottom and left out upper part of cubical part and also lateral surface of hemisphere doen't count that base of hemisphere then why subtracting that base of hemisphere?