74. The volume rate of flow is R= vAwhere A= πr2and r= d/2. Solving for speed, we obtain224.(/2)RRRvAddππ===(a) With R= 7.0 ×10–3m3/s and d= 14 ×10–3m, our formula yields v= 45 m/s, which is about 13% of the speed of sound (which we establish by setting up a ratio:
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