alleryA simple pendulum of length 1 m has period T (g = 9.8). New length needed to double T:
A0.5 m
B1 m
C4 m
D2 m
Answer & Solution
Correct answer: C. 4 m
T ∝ √L. To double T, L must increase 4×.
So new L = 4 × 1 = 4 m.
(Original T ≈ 2.01 s; new T ≈ 4.02 s.)
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