Help:Finding the minimum force to restain a block

[mj1888]

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.

 

[chaoseverlasting]

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.