In the context of Earth's climate history, what do we mean by snowball Earth?
A) This term is used to describe all the ice ages that have occurred in the past few million years.
B) It refers to a time when polar regions had much more snowfall than normal.
C) It is what we expect to see happen on Earth in about a billion years.
D) It refers to a very deep ice age that occurred hundreds of millions of years ago.
D
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Conduction: Two metal rods, one silver and the other gold, are attached to each other end-to-end. The free end of the silver rod is immersed in a steam chamber at 100°C, and the free end of the gold rod in an ice water bath at 0°C. The rods are both 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and their surroundings, except at the ends. What is the temperature at the point where the two rods are in contact with one another? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K.
A. 39°C B. 41°C C. 47°C D. 53°C E. 59°C
An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wing. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?
A. the net force on the airplane is zero B. the net force on the airplane is forward C. the net force on the airplane is upward D. the net force on the airplane is downward E. the net force on the airplane is backward
Determine the change in entropy (in J/K) when 5.00 moles of an ideal gas at 0°C are compressed isothermally from an initial volume of 100 cm3 to a final volume of 20 cm3.
A. ?191 B. ?52 C. ?71 D. ?67 E. ?208
The most common form of gas in the disk of the Milky Way galaxy is
A) atomic hydrogen gas. B) molecular hydrogen. C) gas in hot bubbles. D) gas in stellar winds.