I got a list of problems that will be on some of our exams soon, and i dont know how to do a few of them, heres one.(adsbygoogle = window.adsbygoogle || []).push({});

a 60kg passenger standing on a scale in an elevator notes that the scale's maximum reading is 800 newtons when the elevator accelerates upward. the scales minimum reading is 400 newtons.

You must draw a free-body-diagram of the passenger. You must use the free-body-diagram to determine the elevators acceleration when the scales reading is at the maximum and the minimum.

I know how to draw the diagram, just now sure how to solve the problem.

My geuss is he weighs 60kg, which is 588.6 N after multiplying kg*9.81.

800-588.6=211.4

a=F/m = 211.4 N/60 2Kg = 3.52 m/s^2 down

gravity is expierienced, so total acceleration= 3.52m/s^2 +9.81 m/s^2 = 13.33 m/s^2 down...Thats the total acceleration of the elevator when the scale is its max. Does that look anywhere near correct? Or am i doing this completely wrong? Please help, i have a few more problems too, i really need to know these for the exam i will be taking.

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# Homework Help: Elevator Acceleration Help needed

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