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Q. A severe thunderstorm dumped 2.8 in. of rain in 30 min on a town of area 32 km2. What volume of water, in acre-feet, fell on the town?

Q. A worker stands still on a roof sloped at an angle of 23° above the horizontal. He is prevented from slipping by a static frictional force of 540 N. Find the mass of the worker.

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