As shown in the Discussion Starter of this chapter, 4% of the 9.6 quadrillion Btu of renewable energy in 2014 came from solar systems. How much coal is saved (not consumed) because of the solar energy segment? Assume coal has an average energy content of 10,000 Btu per pound and a coal-fired power plant has an efficiency of 36% and a 6% loss in the transmission lines.
What will be an ideal response?
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Why are Bolivians able to grow wheat, potatoes, and barley at 4250 m (14,000 ft) at the same latitude of rain forests at low elevation where these same crops will not grow?
What will be an ideal response?
The worldwide mineral demand is more than mineral supply.
a. true b. false
Can we alleviate the future mineral-resource shortages by reducing consumption rates?
a. Yes. It is the most efficient way to solve the shortage. b. No, because it is even impossible to keep the current consumption rate (the world-wide consumption rate actually increases every year).
The frequency of a wave is ________.
A. the time between successive waves B. the amount of displacement of the medium through which the wave is passing C. the number of waves passing a given point per unit time D. the energy of the wave