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16. A spring-mass system has a natural period of 0.21 sec. What will be the new period if the spring constant is (a) increased by 50 percent and (b) decreased by 50 percent?
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Given,

$\Im_n\ =\ 0.21 seconds\ = 2π(\sqrt{(\frac {m}{k}}))$

$\sqrt m = \frac {0.21 \sqrt{k}}{2π}$


(a) If the spring constant is increased by 50 percent,

$(\Im_n)_{new}\ =\ \frac {2π \sqrt{m}} {\sqrt{k_{new}}} = \frac {2π \sqrt{m}} {\sqrt{1.5k}} = 2π(\frac {0.21 \sqrt{k}} {2π}) \frac{1}{\sqrt {1.5k}} = 0.17146sec $


(b) If the spring constant is decreased by 50 percent,

$(\Im_n)_{new}\ =\ \frac {2π \sqrt{m}} {\sqrt{k_{new}}} = \frac {2π \sqrt{m}} {\sqrt{0.5k}} = 2π(\frac {0.21 \sqrt{k}} {2π}) \frac{1}{\sqrt {0.5k}} = 0.29698sec $

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