Energy
Energy and Thermal Physics

How many people does it take to build a pyramid?

Stories from Physics for 11-14 14-16 IOP RESOURCES

The Greek historian Herodotus reported that, once the site had been prepared, it took 100,000 men twenty years to build the Great Pyramid. A professor of physics has analysed whether this claim is realistic and estimates that the total work required to construct the Great Pyramid is around 1.3 x 10 13 J. Assuming that one person could do 150 kcal (628 kJ) of work on the pyramid per day, the academic argued that the work could be completed by only 5,700 people over 10 years.

References

Energy
appears in the relation ΔEΔt>ℏ/2 ΔQ=mcΔθ E=hf E ∝ A^2
has the special case Photon Energy
is used in analyses relating to Emission/Absorption Spectra Phase Change
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