A student plays on a see-saw with her experimental android robot, Robby. The student has a weight of 300 N and is seated 2.8 m from the axis of rotation. Robby balances her when he is seated 0.7 m from the axis. Robby's weight is
A. 667 N.
B. 1200 N.
C. 500 N.
D. 725 N.
E. 1000 N.
Answer: B
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The most important reason that an alpha particle can be stopped by a single sheet of paper while an electron of the same energy might not be stopped by hundreds of sheets of paper is that the alpha particle
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