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A rigid object rotates with angular velocity that is given by w(t)=4 rad /s - (8 rad/s3)t
a) Calculate the angular acceleration as a function of time.
b) Calculate the instantaneous angular acceleration B at t=2sec. , and the average angular acceleration B av. for the time interval t=0 to .t=2sec

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5. Water is flowing in a circular pipe of varying cross section. At one place in the pipe the radius of the pipe is r1 = 0.2 m. What must the water velocity be at this point if the volume flow rate in the pipe is 0.8 m3•s-1? At a second point in the pipe the water velocity is = 3.8 m•s-1. What is the radius of the pipe at this point?

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9. Water at 20°C (η = 1005 μPa•s) flows with a speed of 0.35 m•s-1 through a pipe of diameter 3 mm. What is the Reynolds number? What is the nature of the flow?

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