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A vessel completely filled wit water is suspended with help of strings from a spring balance as shwon in figure. A cork is plugged at the bottom of the vessel. If the initial reading of the spring balannce is `W_(0)`. Then the reading of the spring balance just after the cork is removed and the liquid begins to flow out will be `[rho=` density of liquid & A=coss -sectional area of narrow pipe]A. `W_(0)+rhogHA`B. `W_(0)+2rhogHA`C. `W_(0)-rhogHA`D. `W_(0)-2rhogHA` |
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Answer» Correct Answer - D Momentum of water following out of the tube in time `Delta=Deltap=rhoAv^(2)Deltat` where `v=sqrt(2gH)` `thereforeFDeltat=Deltap=rhoAv^(2)Deltat` or `F=rhoAv^(2)=2rhogHA` `therefore` Reading of spring balance `=W_(0)-2rhogHA` |
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