If 1.0 m3 of concrete weighs 5 × 104 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight?

If 1.0 m3 of concrete weighs 5 × 104 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight?

(The compression strength of concrete is 1.7 × 107 N/m2.)