Help:Finding the minimum force to restain a block

AI Thread Summary
To determine the minimum force required to restrain a granite cube with a volume of 30 m3 on a 60-degree discontinuity, the weight of the cube is calculated to be 79.46 kN. The forces acting on the block include the components mg sin(θ) at 68.8 kN and mg cos(θ) at 39.73 kN. The discussion suggests calculating the tension in the anchor when taut, which may already be addressed in the initial calculations. Additional information about the coefficient of friction may be necessary for a complete solution. The focus remains on applying basic statics principles to find the required restraining force.
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Using basic statics determine the minimum load required on a rock anchor to restrain a cube with a volume of 30 m3 if it were resting on a discontinuity with an angle of 60 degrees.

The Attempt at a Solution


the cube in question is meant to be a cube of granite.
it has a density of 2700 kg/m3 and a angle of friction of 34 degrees.
i have calculated the weight using w=mg to be 79.46KN
along with mgsinƟ=68.8KN and mgcosƟ=39.73KN
however i do not know how to calculate the minimum force required to restrain the block.
id be grateful of any help.
 
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From the question it seems like they're asking you to calculate the tension in the anchor when it's taut. I think you've already done that, unless some other information regarding the coefficient of friction etc is given.
 

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