Convection in Earth's mantle is attributed to
A) sinking cold oceanic crust.
B) gravity and heat flow.
C) conduction of heat from Earth's core.
D) temperature differences between continental and oceanic crust.
Answer: B
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A 3 solar mass main sequence star is at a larger distance than a 0.4 solar mass main sequence star. Which star appears brighter?
A. The 3 solar mass main sequence star. B. We cannot tell with the information given. C. The 0.4 solar mass main sequence star. D. The stars are approximately the same brightness. E. It depends on the phase of the Moon.
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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 1.0-?F and a 2.0-?F capacitor are connected in series across a 3.0-V voltage source
(a) What is the charge on the 1.0-?F capacitor? (b) What is the voltage across the 2.0-?F capacitor?
The Rydberg equation is used to