The dominant influence on the length of time a well will produce water is
A) hydraulic conductivity.
B) water supply and demand.
C) hydraulic gradient.
D) aquifer porosity.
Answer: B
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Calorimetry: A person is walking outdoors on a cold day when the temperature is -20°C. He is breathing at the rate of 16 breaths per minute, and each time he breathes in he inhales 0.0050 m3 of air. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/kg ? K and the density of air is 1.29 kg/m3.
A. 60 W B. 90 W C. 100 W D. 150 W E. 300 W
How do scientists estimate the age of the Solar System?
A. They measure the heat content of the planets. B. They measure the ratios of radioactive elements in rocks. C. They count the number of craters on the Moon and Mercury. D. They compare the weathering of rocks on Earth with lunar rocks. E. None of these choices are correct.
During the Dark Ages in Europe, the scientific work of the ancient Greeks was preserved and further developed primarily by scholars in
A) Baghdad. B) Greece. C) Rome. D) India. E) China.
An 8000-kg aluminum flagpole 100 m long is heated by the Sun from a temperature of 10°C to 20°C. Find the work done (in J) by the aluminum if the linear expansion coefficient is 24 × 10^?6 (°C)?1 . (The density of aluminum is 2.7 × 10^3 kg/m3 and 1 atm = 1.0 × 10^5 N/m2.)
a. 287 b. 425 c. 213 d. 710 e. 626