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    A student used a digital stopwatch three time 10 oscillations of a pendulum. The timings were 13.52s, 13.64s and 13.58s
    a) Calculate i the average time for 10 oscillations, ii the time period of the oscillations.
    b) Estimate the accuracy of the timings, giving a reason for your estimate.

    The problem i have is with part b. In maths to estimate is 2 sf.(my answer 1.4 to s.f)
    if i give my estimate my answer how do i give a reason. I feel to give my estimate to 2 sf because it seems to be the standard in physics (I could be wrong)
    but also knowing that gate timers and other forms of measuring time make be more effective than a stopwatch am i suppose to estimate the time on those and give it as my answer since it will be more accurate?

    I just a bit confused and need a second opinion

    For part b, I would say that the accuracy is  \pm0.06s since that is the greatest distance between the mean and a result ( 13.58 - 13.52 )
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Updated: October 29, 2016
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