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Q. A diver 40 m deep in 10 Celcius fresh water exhales a 1.5-cm-diameter bubble.

What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 20^Celcius? Assume that the air bubble is always in thermal equilibrium with the surrounding water.

Q. A meteoroid is speeding through the atmosphere, traveling east at 21.5 km/s while descending at 19.0 km/s. What is its speed, in km/s?

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Category:- Physics
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