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8. If a pendulum with length \( 169 cm \) has a fr...

8. If a pendulum with length \( 169 cm \) has a frequency of \( 1 / 20 Hz \) , find the length of a pendulum that has frequency \( 1 / 5 Hz \) , given that you know that the frequency varies inversely with the square root of the length. If the answer is not an integer, enter it as a decimal. Round the decimal to the nearest tenth. 


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