Question

A clock which keeps correct time at 20⁰C has a pendulum rod made of brass. How many seconds will it gain or lose per day when temperature falls to 0⁰C (a = 18 × 10^–6/⁰C) ?

• A. 155.5 s
• B. 15.55 s
• C. 25.55 s
• D. 18.55 s

Answer 1

Answer: (B)

15.55 s

Answer 2

DT =$\frac{1}{2}$µ TDq = $\frac{1}{2}$ × 18 × 10^–6 × 86400 s × 20

= 1.8 × 8.64 s = 15.55 s