A block of negligible mass rests on a surface that is inclined at $30^{\circ}$ to the horizontal plane as shown in the figure. When a vertical force of $\text{900 N}$ and a horizontal force of $\text{750 N}$ are applied, the block is just about to slide.
The coefficient of static friction between the block and surface is _______ ($\textit{round off to two decimal places}$).