1. Water flows at 5 L/s through a horizontal pipe that narrows smoothly from 12

Question

1. Water flows at 5 L/s through a horizontal pipe that narrows smoothly from 12 cm diameter to 6 cm diameter. A pressure gauge in the narrow section reads 47 kPa. What is the reading of a pressure gauge in the wide section? Express the result in the unit kPa

2.A hypodermic needle is 2.8 cm long and has an inner radius of 0.012cm. What excess pressure is required along the needle so that the flow rate of water though it is 0.0008 kg/s? Use ? = 1.0 x 10-3 Ns/m2 for water. Express the result in the unit Pa

Explanation / Answer

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