.A biconvex lens of focal length 20 cm is cut out into two plano-convex lenses. The focal length of each part is a) 10 cm b) 20 cm c) 30 cm d) 40 cm

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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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