Which of the following features of the Solar System does the solar nebula hypothesis explain?
A. All the planets' orbits lie in nearly the same plane.
B. All the planets orbit the Sun in the same direction.
C. The planets nearest the Sun contain only small amounts of substances that condense at low temperatures.
D. All of these choices are correct.
Answer: D
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An airplane has a mass of 30,000 kg and travels at 300 m/s. If the drag force is 1000 N, the power the engines have to provide to keep flying at a constant speed is
a. 
b. 
c. 
d. 
e. 
The singularity of a black hole is where general relativity predicts the density to become infinite
Indicate whether the statement is true or false
Which stars in globular clusters are believed to be examples of mergers?
A) brown dwarfs B) eclipsing binaries C) blue stragglers D) blue supergiants E) planetary nebulae cores
Series Resonance: In the figure, which of the phasor diagrams represents a series RLC circuit driven at resonance?
A. 1 B. 2 C. 3 D. 4 E. 5