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------------------------------------------------ Mechanics of Machinery

The rocker of a crank-rocker mechanism is to have a length of 100 mm. The length between ground pivots is 250 mm. The rocker has a throw angle of 45° with a time ratio of 1.0.

A crank-rocker mechanism is a type of four-bar linkage system where the output link (rocker) moves back and forth within a certain angle range (throw angle) due to the rotation of the input link (crank). The given lengths and angle help to determine the motion of this linkage system.

Explanation:

The rocker in a crank-rocker mechanism refers to one of the four bars in the linkage system. The movement of the rocker, specifically its throw angle, is determined by the geometry and proportion of the other bars in the system.

In this case, the question gives a length of 100mm for the rocker, a distance of 250mm between ground pivots, and a throw angle of 45 degrees.

In a crank-rocker mechanism, these quantities are important for understanding how the linkage system will move. As the crank (the driving link) rotates, it moves the rocker (the output link) back and forth within its throw angle.

The time ratio of 1.0 indicates the rocker spends equal time in both directions.

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