A piece of copper and other of germanium are cooled from the room temperature to 80 K, then

(a) Resistance of each will increase

(b) Resistance of copper will decrease

(c) Resistance of copper will increase while that of germanium will decrease

(d) Resistance of copper will decrease while that of germanium will increase

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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