A) the MA:
"\\frac{F_{load}}{F_{in}} = \\frac{2{\\pi}r}{l} = \\frac{2*\\pi*4*12~\\text{''}}{0.5~\\text{''}} \\approx 603.19. \\\\"
B)
"F_{load} = F{in}\\frac{2{\\pi}r}{l} = 50~\\text{lbs}*\\frac{2*\\pi*4*12~\\text{''}}{0.5~\\text{''}} \\approx 30159.29~\\text{lbs}. \\\\"
C)
Mechanical efficiency measures influence of friction on the transformation of the input force into the effective load exerted on the force and is usually a dimensionless number between 0 and 1 (100%). Since no data on the friction or losses is included in the problem, one can only the efficiency is 1 (100% / ideal machine).
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