2004
Mathematics
JAMB
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
A.
96 cm
B.
324 cm
C.
36 cm
D.
144 cm
Correct Answer: 324 cm
Explanation
L∝T 2 L=kT 2 k=L/T 2 when T = 4, L = 64. k=64/4 2=4 L=4T 2 when T = 9, L=4×9 2=324cm
L∝T 2 L=kT 2 k=L/T 2 when T = 4, L = 64. k=64/4 2=4 L=4T 2 when T = 9, L=4×9 2=324cmTHIS WEEK's
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