Questions
A small opening near the bottom of the vessel shown in figure has area ‘A’. A disk is held against the opening to keep the liquid from running out. Let be the net force on the disk applied by liquid and air in this case. Now the disk is moved away from the opening a short distance. The liquid comes out and strikes the disk inelastically. Let be the force exerted by the liquid in this condition just after the disc is moved. Then is
detailed solution
Correct option is A
Let ‘ρ ’ be the density of liquid. Then F1=(ΔP)A=ρgh A …………………(1)In the second caseF2= rate of change of momentumρAv2=ρA(2gh)2 Or F2=2ρgh A ……………(2)From equations (1) and (2)F1F2=12Talk to our academic expert!
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There are two identical small holes of area of cross-section a on the opposite sides of a tank containing a liquid of density . The difference in height between the holes is h. Tank is resting on a smooth horizontal surface. Horizontal force which will has to be applied on the tank to keep it in equilibrium is
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