Which of the following best describes how the Drake equation is useful?
A) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence.
B) It allows us to calculate the masses of planets orbiting other stars.
C) It has allowed us to determine the number of civilizations in the Milky Way Galaxy.
D) It helps us understand what we need to know in order to determine the likelihood of finding other civilizations.
D
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A _________composite is one that produces no shear strains when stressed in tension.
Fill in the blank(s) with the appropriate word(s).
Resistors in Combination: What is the equivalent resistance in the circuit shown in the figure?
A. 80 ? B. 55 ? C. 50 ? D. 35 ?
A 50.00 ml sample of mercury at room temperature (293.0 K) is cooled. What is the volume of the sample when the mercury reaches 273.0 K? The coefficient of volume expansion of mercury is 182.0 x 10-6 K-1.
A. 49.39 ml B. 49.94 ml C. 49.82 ml D. 48.18 ml E. 49.96 ml
Why is Pluto NOT considered a Jovian planet?
A. Its atmosphere is rich in oxygen, making it more like Earth. B. Its mass and radius are very small, and it lacks the thick atmosphere of hydrogen seen on the other Jovian planets. C. It is so far out in the Solar System. D. Its interior is mostly rock and iron. E. It is not really orbiting the Sun but is simply drifting through the outer edge of the Solar System.