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Q. An object weighs 315N in air. When tied to a string, connected to a balance, and immersed in water, it weighs 265N. When it is immersed in oil, it weighs 269N. find the density of the object. find the density of the oil.

Q. A parallel-plate capacitor has an area of 2.0cm^2, and the plates are separated by 2mm.

a)What is the capacitance?

b)How much charge does this capacitor store when connected to a 6.0 V battery?

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