Physics

Problem

A uniform plank

2.0\,\text{m}

long has a mass of

25\,\text{kg}

. Its left end is attached to a frictionless pin that can exert forces only perpendicular to the plank. A vertical cable is attached at a point located

x

meters from the left end and supports the plank. A

60\,\text{kg}

painter stands on the rightmost end of the plank. If the pin is to exert no vertical force on the plank, what value of

x

satisfies static equilibrium? (Take

g = 9.8\,\text{m/s}^{2}

.) a)

2.0\,\text{m}

1.5\,\text{m}

1.7\,\text{m}

1.9\,\text{m}

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