A pendulum clock loses 12 s a day if the temperature is 40 °C and gains 4 s a day if the temperature is 20 °C. The temperature at which the clock will show correct time, and the coefficient of linear expansion (a) of the metal of the pendulum shaft are respectively:
A. 60 πC, a = 1.85 × 10-4/πC
B. 30 πC, a = 1.85 × 10-3/πC
C. 55 πC, a = 1.85 × 10-2/πC
D. 25 πC, a = 1.85 × 10-5/πC
Answer:D
A pendulum clock loses 12 s a day if the temperature is 40 °C and gains 4 s a day if the temperature is 20 °C. The temperature at which the clock will show correct time, and the coefficient of linear expansion (a) of the metal of the pendulum shaft are respectively:
A. 60 πC, a = 1.85 × 10-4/πC B. 30 πC, a = 1.85 × 10-3/πC C. 55 πC, a = 1.85 × 10-2/πC D. 25 πC, a = 1.85 × 10-5/πC