15. The period of the vertical oscillations of a mass hanging from a spring is known to be constant.
(a) A student times single oscillations with a stopwatch. In 10 separate measurements, the
stopwatch readings were:
1.8 s, 1.9 s, 1.7 s. 1.9 s, 1.8 s, 1.8 s, 1.9 s. 1.7 s, 1.8 s, 1.8 s.
What is the best value obtainable from these readings for the time of one oscillation?
Explain how you arrive at your answer.
best value =
explanation
(b) Describe how, using the same stopwatch, the student can find the period of oscillation
more accurately

15.3 cos 65 degrees trig

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d) physical means can be used to separate the components of air.

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