100.(C) Agriculture accounts for 92% of all freshwater use globally. China,
India, and the United States are responsible for nearly 38% of global water
consumption. The United States leads the world in per capita consumption
of freshwater: 751,000 gallons (2,842 m^3 ) each year, compared with the
global average of 366,000 gallons (1,385 m^3 ) per year.
FREE-RESPONSE EXPLANATIONS
Question 1
10 Total Points Possible
(a) 5 points maximum Calculate the total amount of energy (in Btu) to wash the
clothes using the washing machine.
Mass of water:
Energy to heat water:
Energy to run washing machine (kWh):
Energy to run washing machine (Btu):
Total energy for washing machine:
11,200 Btu + 2,550 Btu = 13,750 Btu (1 point) (b) 2 points maximum Calculate
the total amount of energy (in Btu) to wash the clothes by hand.