If iron with 4.26 weight percent carbon is cooled to room temperature in a normal manner from the melting temperature, it is called _________cast iron.
Fill in the blank(s) with the appropriate word(s).
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According to scientists, the naturally occurring greenhouse effect makes Earth about 31?C warmer than it would be if there were no greenhouse gases in our atmosphere. How do scientists "know" what Earth's temperature would be without greenhouse gases?
a. Ancient fossils allow them to infer Earth's temperature at a time before our atmosphere contained greenhouse gases. b. They estimate it by averaging guesses made by many individual scientists. c. They assume that this temperature would be about the same as the temperature of Mars, which has much less of an atmosphere than Earth. d. They calculate this temperature from Earth's reflectivity and distance from the Sun.
A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about force of static friction f on the block?
A) f = mg sin ? B) f = mg cos ? C) f > mg D) f > mg cos ? E) f > mg sin ?
Assume that D and R have units of meters, T has units of seconds, m and M have units of kilograms, has units of meters per second, and has units of m/s2. Which of the following equations has self-consistent units?
A. D = mR2
B. m = M[1 + R2]
C. D = [1 – m/M]gT2
D. 
= mv2/R
E. D = 
2/RT
F. None of these can be correct.
Which kind of robotic space mission enables us to determine the chemical composition of a solar system body in a laboratory?
A) sample return B) flyby C) lander/probe D) orbiter