For P7:- a. A lifting system is arranged using number N pulleys to lift a mass of m kg vertically through a height of h metres. It is found that a force of FN is needed to lift the load. Calculate:- i. the efficiency of the pulley system as a lifting device 11. the work done by the effort E P7a gieob ortolooro brs de clems of zonduals in data No of pulley Mass Height Force Set N m kg h metres f Newtons 1 4 135 2.2 460 2 ment 6 170 bu 2.4 300 tluasi srl 16 ofteilsendo e ni enolueeycles 3 8 190 Tedi host 2.6 270 ed Vam 110 ni ed is 4 bettings ton 10 9 210 10 2.7 350 uo beaco 510 oniM 6 225 2.8 11 896 250 2.9 pau 12 13 4 110 3 10 10 80 4 440 boiler izum enibiving babimme 450 16 ansbui oldsige os fon al m 300 98