How much work does the escalator do on Sau-Lan?
Work equals force x distance: W= F * D The work the escalator is doing on Lan is against gravity, so we need to calculate the vertical componet of distance: D = 227 m * sin 31 = 117 m F = mg = 57 kg * 9.81 m/s^2 = 559 N Plug these into the work equation: W = 117 m * 559 N = 65,374 N*m = 65,374 j You may want to round this to two significant figures: W = 65,000 j
