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Mohad Rehman
Mohad Rehman asked in Science & MathematicsMathematics · 2 years ago

Mechanics machines and frames?

Angle theta equals 15 degrees and P equals 120 N

My question is why cant we isolate member AC and take moments about A to find the force at C and then use it to find the pressure, why is the answer coming from this method in correct

Ma = 0

-P(280) +Fc(cos15) (80) =0

Why dkes this give an incorrect solution

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3 Answers

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  • ?
    Lv 7
    2 years ago

    I think, you have to just equate.

    Fc * 80 cos theta= 220*200 cos theta

    Fc= 220*200/80=550 N

    Piston has to apply 550 N to keep that in equilibrium.

  • John
    Lv 5
    2 years ago

    Should work! Did you get 434.8lb as your Fc?

  • ?
    Lv 7
    2 years ago

    The net force at C is not perpendicular to AC.

    There will be a compressive or tensile force along AC which has a vertical component which changes the force on the piston.

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