Before using a hypodermic needle to inject medication into a patient, a nurse tests the needle by shooting a small amount of the liquid into the air. The barrel of the needle is 1 cm in diameter and the tip is 1 mm in diameter. If the nurse pushes the piston with a speed of 2 cm/s, how fast does the liquid come out the tip? a) 4 cm/s b) 20 cm/s c) 40 cm/s d) 200 cm/s

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