Discussion
A sphere's drag coefficient falls from about \( 0.50 \) to about \( 0.10 \) through the drag crisis. Its drag is reduced by
Answer: B
The ratio is \( 0.10/0.50 = 0.2 \), so four fifths of the drag has gone. That a mere change in the state of a layer a millimetre thick can remove eighty per cent of the drag is one of the more striking results in the subject.
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