A wedge M and a block N are subjected to forces P and Q as shown in the figure. If force P is sufficiently large, then the block N can be raised. The weights of the wedge and the block are negligible compared to the forces P and Q. The coefficient of friction \( \mu \) along the inclined surface between the wedge and the block is 0.2. All other surfaces are frictionless. The wedge angle is 30°. 
The limiting force \( P \), in terms of \( Q \), required for impending motion of block N to just move it in the upward direction is given as \( P = \alpha Q \). The value of the coefficient \( \alpha \) (round off to one decimal place) is:
