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Q. A magnetic field of 0.1 T forces a proton beam of 1.5 mA to move in a circle of radius .1m. what is the speed of the proton in the beam as it moves in the circle?

Q. A human being can survive a feet-first impact at speeds up to roughly 12 m/s (i.e., 27 mi/h) on concrete; 15 m/s (i.e., 34 mi/h) on soil; and 34 m/s (i.e., 75 mi/h) on water. Explain the spread in these values.

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