After the New Horizons flyby, scientists concluded that Pluto has probably been geologically active within the past 100 million years or less. Why?
A. Large regions of the surface have very few impact craters.
B. We see places where liquid water has been upwelling from as subsurface ocean.
C. Smooth regions of the surface are made of nitrogen ice.
D. The surface coloration can only be explained by active volcanism.
E. Tall mountains are made of water ice.
Answer: A. Large regions of the surface have very few impact craters.
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In a thermodynamic process, the internal energy of a system in a container with adiabatic walls decreases by 800 J. Which statement is correct?
a. The system lost 800 J by heat transfer to its surroundings. b. The system gained 800 J by heat transfer from its surroundings. c. The system performed 800 J of work on its surroundings. d. The surroundings performed 800 J of work on the system. e. The 800 J of work done by the system was equal to the 800 J of heat transferred to the system from its surroundings.
?
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Exhibit 3-1
The three forces shown act on a particle.
Use this exhibit to answer the following question(s).
Refer to Exhibit 3-1. What is the direction of the resultant of these three forces?
A. 35°
B. 45°
C. 65°
D. 55°
E. 85°
A 4.0-mF capacitor initially charged to 50 V and a 6.0-mF capacitor charged to 30 V are connected to each other with the positive plate of each connected to the negative plate of the other. What is the final charge on the 6.0-mF capacitor?
a. 20 mC b. 8.0 mC c. 10 mC d. 12 mC e. 230 mC
An important feature of the Carnot cycle is that
A) its efficiency can be 100%. B) its efficiency depends only on the absolute temperature of the hot reservoir used. C) its efficiency is determined by the temperatures of the hot and cold reservoirs between which it works and by the properties of the working substance used, and on nothing else. D) it is an example of an irreversible process that can be analyzed exactly without approximations. E) no engine can be more efficient than a Carnot engine operating between the same two temperatures.