7. When measuring the period of the glider with the sail, why do you stop the glider after 5 cycles? (a) That is enough to measure an accurate period. (b) The motion of the glider becomes too small after 5 cycles to accurately determine when to stop the stopwatch. (c) Five cycles is a compromise with enough cycles to accurately measure the period while the amplitude is roughly the same. (d) The sail increases the period of the glider so much that it would take too long to measure 10 cycles.

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