If a1 , a,, ___ , a, are in H.P., then the expression a,a, + a,a, + ... +a, ,a, is equal to { 1)n(a, a,) (2){n 1)(a, a,) (3)na,a, (4){n 1)a1a,

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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