An iron bar of length ‘l’ m and cross section ‘A’ m2 is pulled by a force of ‘F’ Newton from both ends so as to produce and elongation in meters. Which of the following statement statements is correct(a) Elongation is inversely proportional to length l(b) Elongation is directly proportional to cross section A(c) Elongation is inversely proportional to A(d) Elongation is directly proportional to Young’s modulus

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

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