2) There are 2n objects each of three kinds given to two persons, such that each person gets 3n objects. The number of ways of such distribution is equal to

a) 3n² + 3n + 1

b) ^4n-1C_3n

c) ^3n-1C_2n

d) 3n² - 2

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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