Understanding and Solving Vertical Structure Stress Equations

[yui859126455]

Homework Statement

http://holland.pk/uptow/i4/4af070d190cc175e6ca5d326cd60cda2.png The attempt at a solution
the question have a possible solution? that equation is based on stress is constant, so how to use this equation to proof? i m a year 2 student. i can only solve part i
https://lh3.googleusercontent.com/zh2i6XCfF7wF4N3qi67U6ul0qfoRAOisQKwq88wE24iAMWns4lr2ra469lf_vXVgUpkSmONlvkKvtZznGqKHYzNEAFRrOS2QUO2exMCnL6-fTeKLr4qqBFryXguY_maGmHqp98naMWtOoB_3p5WshkynZhkPjks6epP5blbL8rlBKs3lS-OrkY0x1CTaeG-KXEDMxLN7X0SBcZo3ny_iMRx1ffRyT0A5wu7QmZeVcVPcVfsSNGVxc-S216sOZWPrf72rAf_DhCDM4Eb8DFzLh1qTHjZ-74FsGUMb8Lq7fuB0tNfM4YZbVlUYVEqYAQYp8QPI6rajRBT0C3rb9qruvKk_l0-rtFG6nLUUqm22j6RZWHeSNkS3ldvplg-_1n4xlw6mP-kBCkQmVn09zulD34JWINZ4eAo9bv4ppZBoXxJbJWGnSi8CNAS0GG-7MfhwqwARfFyc695DupPTLTr5YTlYcmaECNyxsD6f56qD01bRgcOHTjqYkOCuXZNHU5wF2D7npMogEECccVOl0y8AJkqBHWoxQwEwXrzAAjT-YGL47QBPHKOuPTtT3KSpnkOKaTbc7CQ7kxnQEtovJ_i-xEzrJZzd5yIdPXGHn4hosIfNNIqS=w686-h914-no

 

[yui859126455]

help

 

[yui859126455]

help

 

[yui859126455]

help

 

[Nidum]

I've been puzzling over this since you first posted the question . Part 2 does not make much sense as written .

It might make more sense if the wording ' Determine the stress at the top of H ' was changed to ' Determine the radius r at the the top of H ' and if you had actual values for the compressive strength and density of the concrete .

Finding the radius r would not actually be too difficult but our efforts might be wasted if our understanding of the question is wrong .

Sorry I can't be more helpful .