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वह अधिकतम चाल ज्ञात कीजिये जिससे क्षैतिज सड़क पर 30 मीटर त्रिज्या के मोड़ पर कोई कार मुड़ सकें , यदि रबड़ तथा सड़क के बीच घर्षण गुणांक 0.4 हो । ( `g = 10 "मीटर / सेकण्ड"`^(2)`)

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क्षैतिज सड़क पर मुड़ने के लिये आवश्यक अभिकेंद्र बल घर्षण बल से प्राप्त होता हैं , जिसके लिए `v_(max) = sqrt(mu_(s) rg)`
` प्रश्न में , `mu_(s) = 0.4 , r = 30` मीटर , `g = 10 "मीटर/सेकण्ड"`^(2)`
`v_(max) = sqrt(0.40 xx30 xx10)`
= 11 मीटर / सेकण्ड

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