The lift-tong mechanism shown consists of twin four-bar linkages and is used to lift a 40-kg machine component. Knowing that LAB = 36 mm, determine the smallest allowable value of the coefficient of static friction between the component and the gripping pads when
(a) a = 0,
(b) a =30°.
![544_coefficient of static friction.jpg](https://secure.tutorsglobe.com/CMSImages/544_coefficient of static friction.jpg)