## 3 thoughts on “4.26”

1. blake.wallace95 says:

4.26 10th edition = 4.28 11th edition

2. blake.wallace95 says:

Can you explain how even though the angular acceleration (Theta double dot) is zero, that we can assume that Phi double dot still exists? Also, why is it that we can put the made-up angle, Phi, in our final answers if Phi was not given in the original problem? I suppose we could make a relationship between Theta and Phi to make the answers in terms of Theta?
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1. tutorpaul says:

As the last equations in this solution show, the angular acceleration of bar $AB$ is dependent on the angular position, velocity, and acceleration of bar $CD$. To say that bar $AB$ will not accelerate because $CD$ didn't accelerate is a gross over-simplification of the motion of these sorts of mechanisms.

When we think about rigid bodies we must assume that they have acceleration, velocity, and position; until we can demonstrate otherwise.