Kinematics of Particles: Acceleration Calculation in a Slotted Arm Spiral Guide

[amiv4]

Homework Statement

The slotted arm OA forces the small pin to move in the fixed spiral guide defined by r=Kθ. Arm OA starts from rest at θ=π/4 and has a constant counterclockwise angular acceleration $$\ddot{theta}$$ =α. Determine the magnitude of the acceleration of the pin when θ=3π/4.

Answer is a=10.76Kα

any help is appreciated.

The Attempt at a Solution

I have no clue where to start.

 

[nvn]

Hi, amiv4. Start by reading your textbook and studying the example problems. The PF rules state, you must list relevant equations yourself, and show your work; then someone might check your math.