maths

A large pipe has a diameter of 9.8×10^2cm.Water flows in the pipe at a speed of 5m s^-1.Find the volume in m^3,of water that flows out from the pipe every second,correct to 2 significant fogures.[Take pai as 3.142]

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asked by ashley
  1. 9.8x10^2 cm = 980cm = 9.8m
    So, the rate of flow is

    pi*4.9^2 m^2 * 5m/s = 377 m^3/s

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    posted by Steve
  2. Steve,how to get 4.9?

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    posted by ashley
  3. Ohh..i got it..divide two..thanks a lot!

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    posted by ashley

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