The atmosphere of Titan is composed mostly of
A) oxygen.
B) methane.
C) carbon dioxide.
D) hydrogen.
E) nitrogen.
E
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Multiple-Object Accelerating Systems: A locomotive is pulling 9 freight cars, each of which is loaded with the same weight. The mass of each loaded car is 37,000 kg, and we can neglect friction on these 9 cars. If the train is accelerating forward at 0.81 m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car.)
Fill in the blank(s) with the appropriate word(s).
Rank the launch angles for the five paths in the figure below with respect to the time of flight, from the shortest time of flight to the longest
Find the equation 
that fits the following data.
t(sec) 0 1 2 3 4 5
x(m) -16 -12 0 20 48 84
A. 
B. 
C. 
D. 
Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?
a. microwave c. x-rays b. infrared d. ultraviolet