A 138 g ball is tied to a string. It is pulled to an angle of 6.60 ∘ and released to swing as a pendulum. A student with a stopwatch finds that 14 oscillations take 9.00 s .
Time period of Simple pendulum, T = 2pi sqrt[L/g]
and 14 osscilation takes 9s.
1 oscillation = 1 T = 9/14
So, 9/14 = 2 pi sqrt(L/9.8)
L = 0.103 m ...........length of string.
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