Entries by Daphne Hanson

The Holland-Gaddy relationship.

A coal mine’s entry and breakthrough centers are set at 55 ft with 20-ft-wide openings. The 5.5-ft coal seam lies 850 ft below the surface, and the specific gravity of the overburden is 2.4. If the compressive strength of 4-in. cubic coal specimens is 5,000 psi, determine the safety factor for compressive failure of the […]

The advantages and disadvantages of solar

Explain the advantages and disadvantages of solar, biofuel/biomass, wind, geothermal, and hydroelectric energies. Explain the term, “carbon neutral,” and how biomass can and cannot be carbon neutral. Describe how solar panels work and the limitations and environmental costs associated with solar energy.

How humankind has conquered water

Some people would suggest that humankind has conquered water. To what extent do you agree or disagree with this statement? Give and explain several reasons to support your view, while also debunking at least one opposing viewpoint.