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The equation for the period of a pendulum is:

$$T = 2\pi \sqrt { \frac { L }{ g } }$$

Which of the following assumptions is not needed to apply this equation?

A

The mass is concentrated at the end of the string.

B

The angle of oscillation is small.

C

The string is massless.

D

The tension in the string is constant throughout the swing of the pendulum.

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