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**1. Homework Statement**

The rod OA rotates clockwise with a constant angular velocity of 6 rad/s. Two pin-connected slider blocks located at B move freely on OA and the curved rod whose shape is a limacon described by the equation r = 200*(2-cosθ) mm. Determine the magnitude of the acceleration of the slider blocks at the instant θ = 135°.

**2. Homework Equations**

α

_{r}=r''-rθ'

^{2}

α

_{θ}=rθ''+2r'θ'

α = √(α

_{r}

^{2}+α

_{θ}

^{2})

**3. The Attempt at a Solution**

I am trying to solve for the magnitude using the normal and tangential acceleration components.

r = 200*(2-cosθ) --> r(135) = 541.42 mm θ' = 6 rad/s

r' = 200 sinθ * θ' --> r'(135) = 848.53 mm/s θ'' = 0

r'' = 200cosθ * θ'

^{2}= -5091.17 mm/s2

When I plug all those values in I keep getting the wrong answer. Can someone tell me where I am going wrong?