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एकसमान अनुप्रस्थ-परिच्छेद की ऊर्ध्वाधर U-ट्यूब में 25 सेमी ऊंचाई तक जल भरा है जल को U -ट्यूब की एक भुजा में थोड़ा दबा कर छोड़ दिए जाता है तो दिखाइए इसके फलस्वरूप जल के ताल में होने वाली गति होगी इसके दोलनकाल की गणना कीजिये | (g =9.8 मीटर/`"सेकण्ड"^2`)

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गति सरल आवर्त होगी , इसके लिए अनुच्छेद 13 देखे
प्रश्नानुसार,h=`25xx10^(-2)` मीटर तथा g=9.8 `"मीटर//सेकण्ड"^2`
अतः दोलनकाल `T=2pisqrt(h/g)=2xx3.14sqrt((25xx10^(-2))/(9.8))`
=1.003 सेकण्ड

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