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7 September, 07:34

A girl of weight 600N sits on a 3-leg chair which weighs 60N. Each chair leg presses the floor in a circle with a diameter of 5cm. Find the average pressure exerted on the floor by each chair leg.

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Answers (2)
  1. 7 September, 07:48
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    84033.6134 N/m^2 is the pressure
  2. 7 September, 07:59
    0
    Pressure = total force/total area

    Total force = 660 Newton's

    Total area:

    Each leg contacts the floor with an area of πr^2=π (0.025m) ^2=0.002m^2.

    Total contact area for all 3 legs = 0.006 m^2.

    Pressure = (660N) / (0.006 m^2)

    = 110,000 N/m^2 = 110,000 Pascal's.
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