A 106 g ball is tied to a string. It is pulled to an angle of 7.80 degrees and released to swing as a pendulum. A student with a stopwatch finds that 17 oscillations take 13.0s.
How long is the string?
time period T = 2π √(L/g)
17 oscillations = 13 sec
1 oscillation (T) = 13/17 sec
T = 13/17 s
L = length string
= g * [T/2π]2
= 9.8 * (13/17 * 3.14)2
L = 0.581 meter
= 58.1 cm
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