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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 _______  ($\textit{round off to two decimal places}$).

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