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March 26, 2017

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"A fish hangs from a spring scale supported from the roof of an elevator. If the elevator has an upward acceleration of 1.2m/s^2 and the scale reads 200N, under what circumstances will the scale read 150N? What will the scale read if the elevator cable breaks?"

There was another part of the question that I had figured out. The true force of gravity on the fish is 1.8*10^2N.

  • Physics - ,

    F = m a
    force down on fish = m g
    force up on fish = 200
    acceleration up =1.2
    so
    200 - 9.8 m = 1.2 m
    11 m = 200
    m = (200/11)

    then
    150 - 9.8(200/11) = (200/11)a

    (200/11) (9.8+a) = 150
    9.8+a = 8.25
    a = -1.55 downward

    well if the cable breaks, a = 9.8 dwon
    F - 9.8 m = m (-9.8)
    F = 0

  • Physics - ,

    Thank you for answering both questions! I understand them now.

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