The viscosity of water changes with temperature. If you stir a pot of water for

Question

The viscosity of water changes with temperature. If you stir a pot of water for a few seconds then stop stirring, it will gradually slow down and stop. Which will continue to flow for longer, a pot of water about to boil (at ~100° C) or one at room temperature (~ 20° C)?

Imagine the flow of water through a pipe which has a radius of 10 cm. If the flow velocity in the pipe is 0.1 m/s at a distance 2 cm from the wall, what is the approximate flow velocity at the center of the pipe?

A) 0.01 m/s

B) 0.05 m/s

C) 0.5 m/s

D) 0.1 m/s

E) 1.2 m/s

Explanation / Answer

the answer is option E=1.2 m/sec

Q= V*A

V is velocity

A is area =pie *D2/4

here D is 8cm

V=0.1m/sec

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