The period of a pendulum is 2.0 s in a stationary inertial frame of reference.What is its period when measured by an observer moving at a speed of 0.80c with respect to the inertial frame of reference?
A) 1.6 s
B) 1.2 s
C) 2.5 s
D) 3.3 s

Question

Quizplus · Accepted Answer

Due to time dilation in special relativity, the period of the pendulum will appear longer to an observer moving at a high speed relative to the pendulum. The time dilation factor is given by the Lorentz factor, which is greater than 1 for speeds close to the speed of light.

The Period of a Pendulum Is 2