A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance ofA. each of them increasesB. each of them decreasesC. copper increases and germanium decreasesD. germanium increases and copper decreases

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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