Science
posted by Jack Hill .
container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one
floor to another. To lift 250 1kg containers a vertical distance of 2.4 m, the motor runs for 45 s.
What is the efficiency of the motorized conveyor system?

Science 
drwls
Work output = 250*g*2.4 = 5880 joules
(g=9.8)
Work input = 450*45 = 20,250 joules
For the efficiency, take the output/input ratio
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