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The reaction at the fixation point(let's mark it 'A' point) will consist of reaction force and reaction torque.

The net force for static item, consisting of sum of all the forces and the net torque have both to equal zero.

To calculate force and torque at the fixation point, we need to know two things: mass of the bar and horizontal displacement of bar's center of mass from the fixation point.

Since there are no forces acting in the horizontal plane, we can only take z(height) axis into consideration for forces.

Reaction plus force of gravity have to be zero:

RA + Q = 0, where

Q denotes weight and is equal to Q = m * g, where m is mass of the bar.

Calculated,

RA = -Q,

which means that reaction force is equal to weight, but directed in opposite way.

Sum of all the torques in the bar has to be zero:

MA + Q * l = 0, where

MA is reaction torque at the fixation point,

Q as above

and l is distance from fixation point to bar's center of mass.

Calculated:

MA = -Q * l

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