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When a force acceleration a body immersed in a fluid, some of the fluid must also be accelerated , since it must be pushed out of the way of the body and flow aroundit . Thus , the force must overcome not only the inertia of the body, but also the inetia of the fluid pushed out of the way. it can be shown that for a spherical body completely immersed in a nonviscous fluid, the extra inertia is that of a mass of fluid half as large as the fluid displaced by the body. The acceleration ("in" m//s^2)of small spherical air bubble in water is ("take" g= 9.8 m//s^2). |
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