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The length of the rod of a certain pendulum is decreased, and ... ...

The length of the rod of a certain pendulum is decreased, and the period then decreases by 20%. By how much was the rod length decreased?
(A) 20%
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 01. Introduction

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Ahsia Pinckney

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The length of the rod of a certain pendulum is decreased, and ... ...

Posted: 08/29/2013 09:24

I thought length and time were proportional.

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Admin

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Posted: 08/29/2013 21:24

Ahsia, length is under a square root, so it's not linearly proportional. The explanation is really good. Did you see it?

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