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oil flows through a 4.0 cm i.d. pipe at an average speed of 2.5 m/s. find the flow in m3/s and cm3/s

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cm^3/s = cm^2 * cm/s
so, your volume is
4π cm^2/s * 250 cm/s = 1000π cm^3/s
to get m^3/s, just multiply that by (1m/100cm)^3 or π/1000 m^3/s

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