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Q1. If the weight of a room full of water is so great, why don't the first floors of houses built over basements all collapse while flooded to the ceiling?

Q2. An electron moves in a circular path perpendicular to a magnetic field that has a magnitude of 0.883 × 10-3 T. The angular momentum of the electron as it moves around the center of the circle is 1.40 × 10-25J•s.Find the radius of the circular path.

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