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i am currently designing a solar tracking system. i am confused at the point of calculating the torque required to rotate the solar tracker. i have a shaft in the cylinder which is rotating with 4RPM.

i know that Power= Toque* angular velocity or 2*pi*RPM* Torque

where Torque is= Force* radius

radius= should i take the radius of the shaft? ( please see the picture)

Force= how can i calculate the force?

i know its stupid but i am confused and i need to continue with this

thank you

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# Torque calculation of solar tracker

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