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Q. Four astronauts are in a spherical space station.

1)If, as is typical, each of them breathes about 500 {rm{ cm}}^3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year?

2)What would the diameter (in meters) of the space station have to be to contain all this air?

Q. A bucket of water is whirled in a vertical circle of radius 90cm,What is the minimum speed that will keep the water from falling out?

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