How do terrestrial and giant planets differ? List as many ways as you can think of.
Answer: Closer to sun, smaller, higher densities, silicates and metals. Giants have low densities, far from sun, larger, no solid surface, more moons.
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At a certain time, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A) 280 B) 28 C) 2800 D) 2.8 E) 0.28
A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (?Al = 2.82 × 10^?8 ? / m; ?Al = 3.9 × 10^?3 / °C; ?nichrome = 1.50 × 10^?6 ? / m; ?nichrome = 0.40 × 10^?3 / °C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire is
a. 0.019. b. 0.10. c. 0.18. d. 9.8. e. 53.
Ultraluminous radio sources associated with small visible-light objects are called _______________
Fill in the blank(s) with correct word
Talk about vertigo! You've been dropped at the edge of a cliff, looking down for what seems to be miles! There's only one way to go from here: up! But it's going to be quite a climb, requiring all of the mountaineering skills you've ever heard of
The atmosphere here is very thin even at the mean surface level of this place; at altitude you'll never get a lungful. No matter, though; you could not breathe this atmosphere anyway, since it contains no oxygen; it's mostly carbon dioxide. You climb and climb; this mountain must be three times the height of Everest, and much broader at its base! There are clouds around you, and you can find water ice as well. When you try to melt it, however, it does not turn to liquid (it vaporizes to gas). Oh well, just keep climbing. But what will you do when you get to the top?