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+ <h3> Statement </h3>
+ <p>
+ $3.2.5.$ Find the length of a mathematical pendulum with an oscillation period of $1$ s.
+ </p>
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+ <h3>Solution</h3>
+ <p>
+ The period of oscillation of a mathematical pendulum
+$$ T=2\pi\sqrt{\frac{l}{g}} $$
+Where does the length of the pendulum come from?
+$$ l=\frac{T^2g}{4\pi^2}=24.8\text{ sm} $$
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+ <h4>Answer</h4>
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+ $$l=24.8\text{ sm}$$
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