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A drinking straw 20 cm long and 3.0 mm in diameter stands vertically in a cup of juice 8.0 cm in diameter. A section of straw 6.5 cm long extends above the juice. A child sucks on the straw, and the juice level begins dropping at 2.0 mm/s. (a) By how much does the pressure in the child’s mouth differ from atmospheric pressure? (b) What’s the greatest height above the water surface from which the child could drink, assuming this same mouth pressure?
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