Question

Question #3a5d4

Answer 1

After correction from @stefan_zdre we got better agreement!!!
Thanks Stefan!

Explanation:

IF GPE is Gravitational Potential Energy and `d` is density in `(kg)/m^3`

You have from your formula that:
`GPE_(pyramid)=d*h^2*s^2*g/12=`
Where I think you refer to the expression fo r potential energy `U` as:
`U=mgh`
Where:
`mass=m=d*V` density times volume (`V=s^2h/3`)
And `h=` position of center of mass `=h/4`

With your data and `g=10 m/s^2`
I got:

`GPE_(pyramid)=2.57xx10^12 J`
`GPE_(Blocks)=1.33xx10^12`
`GPE_(Tot)=color(red)(3.9xx10^12) J`

Now if one man generates `160kJ` per day:
You have:
`160xx10^3*2845*23*365=color(red)(3.82xx10^12) J`