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water is flowing through a tube of non-uniform cross-section. If the radii of the tube at the ebtrance and the exit are in the ratio `3:2` then the ratio of the velocites of flow of watern at the entrance and the exit isA. `9:4`B. `4:9`C. `8:27`D. `27 :8` |
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Answer» (b) From equation of conityuity `A_(1)V_(1)=A_(2)V_(2)` `impliespir_(1)^(2)=pir_(2)^(2)V_(2)` `implies(V_(1))/(V_(2))=(r_(2)^(2))/(r_(1)^(2))=(4)/(9)` |
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