Discussion
A body has a drag coefficient of \( 1.2 \) referred to a frontal area of \( 0.5 \) m\( ^2 \). At \( 20 \) m/s its drag is nearest to
Answer: C
The dynamic pressure is \( 0.5 \times 1.225 \times 400 = 245 \) Pa, so the drag is \( 1.2 \times 245 \times 0.5 = 147 \) N. A coefficient of 1.2 on frontal area is characteristic of a bluff body such as a cylinder below the drag crisis.
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