Hydrogen fuel cells, biodiesel, and long-term electric batteries are potential solutions to ________
A) reducing carbon emissions from cars and trucks
B) carbon sequestration
C) cutting back the carbon emissions from hydroelectric plants
D) replacing coal as a major fuel for generating electricity
E) cap-and-trade emission control
A
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Many solvents expand to occupy greater volumes with increasing temperature. What happens to the concentration of a solution made with such a solvent as its temperature is increased?
A. Since it has a greater ability to dissolve more solute at a higher temperature, its concentration has increased. B. The concentration of a solution increases as the solute fits into the new spaces between the molecules. C. Since it has a greater ability to dissolve more solute at a higher temperature, its concentration has decreased. D. Since concentration depends on how much mass is dissolved in a given volume, as the volume increases, the concentration decreases.
The speed of a satellite in circular orbit doesn't change because gravitational force on it is
A. canceled by centrifugal force. B. very weak due to altitude. C. perpendicular to its direction of motion. D. small compared to other forces on it.
Long wavelength, regularly spaced waves that travel out of a source area and continue for long
distances are called:a. chop. b. fully developed seas. c. storm waves. d. white caps. e. swell.
The Fresh Kills Landfill ________
A) site will be converted into a public park B) is the United States' first landfill conversion project C) is New York's first and only modern sanitary landfill D) will remain open until late 2020 E) was abandoned in the late 1970s