In what sense can you truthfully say that you are a part of every person around you?
A) We all live on the same planet and share the same resources.
B) We are continually exchanging our atoms.
C) We all share the same genetic code.
D) There are more people alive now than have ever lived.
Answer: B
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An electric device delivers a current of 5.0 A to a device. How many electrons flow through this device in 10 s? (e = 1.60 × 10-19 C)
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
The main reason that there is a limit to the size of a stable nucleus is
A) the limited range of the gravitational force. B) the short range nature of the strong nuclear force. C) the weakness of the gravitational force. D) the weakness of the electrostatic force.
You are in a place that is extremely hot and dense. You can't see far because your surroundings are opaque to light. Around you, nuclear fusion is converting carbon into oxygen and other elements. Where are you?
A) You are inside a nuclear power plant on Earth. B) You are in the center of a star very much like our Sun. C) You are in the center of a white dwarf. D) You are in the early universe during the era of nucleosynthesis. E) You are in the center of a massive star near the end of its life.
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 20 km/s/Mly. How fast would a galaxy 1000 Mly distant be receding from us?
A) 20,000 km/s B) 20 Mly/s C) 0.20 times the speed of light D) 50 km/s E) 20 km/s