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7. A mass m is supported as shown in the figure by ideal strings connected to arigid wall and to a mass 3m at rest on a fixed horizontal surface. The stringconnected to larger mass is horizontal, that connected to smaller mass is verticaland the one connected to wall makes an angle 60° with horizontal.Then theminimum coefficient of static friction between the larger mass and the horizontalsurface that permits the system to remain in equilibrium in the situation shown is

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