What is the weight of the drop

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Q. What is the weight of the displaced amount of water when the boulder is placed inside the tank (measured in N)? The tank had an original volume of water of 5000 L. When the boulder got placed inside the tank, the volume of water rose to 5010.165 L.

Q. A spherical water drop, 1.50 μm in diameter, is suspended in calm air owing to a downward-directed atmospheric electric field E = 432 N/C.What is the weight of the drop?

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