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A bubble of gas whose diameter is 2 cm is travelling in a liquid with constant velocity of 0.90 cm/s.

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A bubble of gas whose diameter is 2 cm is travelling in a liquid with constant velocity of 0.90 cm/s. The density of the gas is negligible and density of the liquid is 1.5 gm/cm3. Calculate the value of η.

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Here, (-ve) sign indicates that the bubble is moving in the upward direction

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