There are 100 students in a school. 50 use the school library, 40 have their own library and 47 borrow books. 15 use both, the school library and their own books. 14 students borrowed the books and also use their own books. 13 used school and borrowed books. Assuming that all the students use either source of the books. Find the number of students using all three sources

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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