b. A screw jack has a single start thread of pitch P mm and a turning handle of length L mm. The efficiency of the jack as a lifting device is %. Calculate: i. 11. the force required at the handle to lift a load of W tonne the work done on the W tonne load when lifting it through a height of h mm For M4- 2/16/23, 1:04 PM 2000 elpoco - zoninom Jack Edwards - Asst#4a - Simple machines - Google Docs P7b data Screw pitch Barino booper & betslqaro to 15 llu To ta beritipar Length Efficiency p L Load W Height h % mm mm tonne mm 1 27 25 300 2.2 220 2 31 20 20 400 1.4 200 3 33 24 350 1.1 180 200 4 36 32 450 5 38 22 500 0.75 11165 Boninos 0.9 170ostlib 165 sisuls