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Urea pellets are made by spraying drops of molten urea into cold gas at the top...

Urea pellets are made by spraying drops of molten urea into cold gas at the top of a tall tower and allowing the material to solidify as it falls. Pellets 6 mm in diameter are to be made in a tower 25 m high containing air at 20 °C. The density of urea is 1330 kg/m3 . a. What would be the terminal velocity of the pellets, assuming free-settling conditions? 2 b. Would the pel1ets attain 99 percent of this velocity before they reached the bottom of the tower?

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