Which of the following measures would help reduce the need for new electric power plants?
A) Energy storage methods at electric power plants.
B) More energy-efficient use of electricity.
C) "Time-of-day"pricing that charges more for electricity at the "peak" times.
D) All three of the above measures would help.
E) Both measures A and C would help, but not B.
D
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The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is __________
Fill in the blank(s) with correct word
FM radio reception may be blocked by buildings because the wavelengths are too short to be ______________ around buildings
Fill in the blank(s) with correct word
What telescope instrument is used to counter the eastward rotation of Earth?
a. Newtonian focus b. sidereal drive c. active optics d. Cassegrain focus e. floppy mirrors
What are the two main differences between extrasolar planetary systems discovered to date and our Solar System?
A) extrasolar planets tend to be more massive and dense than Jupiter B) extrasolar planet orbits tend to be more eccentric and inclined than in our Solar System C) extrasolar planet orbits tend to be closer and more eccentric than in our Solar System D) extrasolar planet orbits tend to be closer and more circular than in our Solar System E) extrasolar planets tend to be bigger and denser than Jupiter