Chapter 8225P8.18In the swing down to the breaking point, energy is conserved:mgrmvcosθ=122at the breaking point consider radial forcesFmaTmgmvrrr∑=+−=maxcos2Eliminate vrg22=cosgmggTmgmaxmaxmaxcoscoscoscoscos...−===FHGIKJ=FHGGIKJJ=°−−θθ23344 598040 811N32.00kgms2bgej*P8.19(a)For a 5-m cord the spring constant is described by Fkx=,mgk=15. maf. For a longer cord of length Lthe stretch distanceis longer so the spring constant is smaller in inverse proportion:kLmgmg LKU Umgymgykxmg yykxmgLxgsififfff==++=++=++=5333000121212222m1.5 m..diinitialfinalFIG. P8.19(a)here yyLxf=+55 m55 01233355055 05 04 101831 67
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .