The length L of a simple pendulum varies directly as the ...
The length L of a simple pendulum varies directly as the square of its period T. If a pendulum with period 4 sec. is 64 cm long, find the length of pendulum whose period is 9 sec
96 cm
324 cm
36 cm
144 cm
Correct answer is B
L∝T2
L=kT2
k=LT2
when T = 4, L = 64.
k=6442=4
L=4T2
when T = 9,
L=4×92=324cm
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