viewimageM.php?id=physicalscience&no=29bcc427b38477a16fb3dab004c86b6fd0548bb7fdb4d15d4d49638adabdc8ac41e27800451d231a6962b4ce794e1ffd94abd4290162283ce29eb61c746bd5046ceffdb76127c10cee6bb1cd4b312db843b47aa15b2e

T=2π루트 l/g