8.60. Model:Assume the particle model for a sphere in circular motion at constant speed. Visualize:Solve: (a)Newton’s second law along the rand zaxes is: 212sin30sin60trmvFTTr=°+°=∑1G2cos30cos600 NzTF+°−=∑Since we want ,TTT==these two equations become ()2sin30sin60tmvTr°+° =( )cos30cos60TmgSince sin30sin60cos30cos60 ,°=°2ttmvmgvrgr=⇒=The triangle with sides
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