If the length of the pendulum in pendulum clock increases by 0.1%, then the error in time per day is:
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If the length of the pendulum in pendulum clock increases by 0.1%, then the error in time per day is:

G1 Physics · Accepted Answer

For a pendulum T∝√L, so ΔT/T=(1/2)ΔL/L=0.05%. A clock with larger period loses time by the same fraction: 0.0005×86400 s=43.2 s per day. Correct answer: C.