Q2. Two water pipelines converge into one line of 2.5m diameter. a). What is the velocity of water flowing in the converged line if the discharges and diameters of the converging lines are 1 m3/s with an 800mm pipe and 0.5 m3/s with a 500mm pipe? (m/s) b). What is the mass flowrate under these conditions? (kg/s) c). What percentage change in velocity would there be in the converged pipe if the diameter of the pipe was reduced by 20%? Take the density of water to be 103 kg/m3. Part a). is denoted Q5, part b). as Q6 and part c). as Q7

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.