[问答题]
(a) What minimum for;m dzykw*v0fl 6 twcqi7,q8/f ce F is needed to lift thew)-meh5.k8j aymb s.c piano (mass M ) using the pulley appara)mcbj e5.8shm -.wa kytus 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}$ ,
