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Q. A child loses his balloon, which rises slowly into the sky. If the balloon is 23 cm in diameter when the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension can be neglected.

Q. A tsunami of wavelength 270 and velocity 750 travels across the Pacific Ocean. As it approaches Hawaii, people observe an unusual decrease of sea level in the harbors. Approximately how much time do they have to run to safety.

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