Fluid MechanicsMedium
Question
A piece of cork starts from rest at the bottom of a lake and floats up. Its velocity v is plotted against time t. Which of the following best represents the resulting curve ?
Options
A.
B.
C.
D.
Solution
As the cork moves up, the force due to buoyancy remains constant. As its speed increases, the retarding force due to viscosity increase, being proportional to the speed. Thus the acceleration gradually decreases.
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