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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?
what is normal reaction? is it always equal to weight(mg) of an object?
If not, 1.when it is not equal? & 2.how much is it different cases?
what is normal reaction for a vehicle performing circular motion along concave bridge & convex bridge?(explain with the help of centripetal force, weight "mg".)