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  4. If air is blow n with a straw under of the pans of a physical balance present in equilibrium position, then that pan.

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Q. If air is blow n with a straw under of the pans of a physical balance present in equilibrium position, then that pan.

Mechanical Properties of Fluids

Solution:

As the air is blown, the speed of air particles is more than the surrounding air. So, there would be an air pressure, $\frac{1}{2} \rho v ^{2}$. So the pan will lower down.