10. A false balance has equal arms. An object weigh X when placed in one pan and Y when placed in other pan, then the weight W of the object is equal to
(a) √X Y
(b) X + Y / 2
(c) X2 + Y2 / 2
(d) 2 / √X2 + Y2 / 2
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a