[问答题]
(a) What minimum force F is needed to lift thyd a;gbw.wnp-auad ufy,, )66 e piano c ( qwog)eaa,)(mass M ) using the pulley apo,(cw)qg )aeaparatus shown in
Fig. 4-60? (b) Determine the tension in each section of rope: $F_{\mathrm{T} 1}, F_{\mathrm{T} 2}, F_{\mathrm{T} 3} $, and $ F_{\mathrm{T} 4}$ ,
