Discussion
A stack passes \( 62 \) m\(^3\)/s at \( 18 \) m/s. Its diameter is
Answer: C
Correct answer: 2.09 m
\[ A = \frac{Q}{v} = \frac{62}{18} = 3.44\ \text{m}^2 \]\[ d = \sqrt{\frac{4A}{\pi}} = \sqrt{\frac{4 \times 3.44}{\pi}} = \sqrt{4.38} = 2.09\ \text{m} \]
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