Yung hangs a mass from a rod, sets the pendulum in simple harmonic motion, and determines the period of the pendulum. How could Yung decrease the period of the pendulum?

For a simple pendulum, the period is T = 2π√(L/g), where L is the rod’s length and g is gravitational acceleration. A shorter rod makes the period smaller. Changing the mass does not affect the period, while a longer rod would increase it. Therefore, he could use a shorter rod.

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