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Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

What are similarities and differences between refraction, reflection, diffraction and absorption?