A 30 cm diameter pipe, conveying water, branches into two pipes of diameters 20 cm and 15 cm respectively. If the average velocity in the 30 cm diameter pipe is 2.5 m/s, find the discharge in this pipe. Also determine the velocity in 15 cm pipe if the average velocity in 20 cm diameter pipe is 2 m/s.
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Given that in a stack, there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. Therefore, the total thickness of the stack is = (100+0.08) mm = 100.08 mm.
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