Why did the student record the time for 20 swings?
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Make a copy of Table 1.4 and, for each length of the pendulum, calculate the time for one oscillation and record the value in the third column of the table.
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Plot a graph of the penod of the pendulum agamst its length (that is, plot the length of the pendulum on the x -axis).
d Use the graph to work out the length of the pendulum when the penod is 2 seconds.
This is the length of pendulum used in a grandfather clock.