You find yourself in a place that is unimaginably hot and dense. A rapidly changing gravitational field randomly warps space and time. Gripped by these huge fluctuations, you notice that there is but a single, unified force governing the universe
Where are you?
A) You are floating somewhere in the universe near its end, 10100 years from now.
B) You are in the center of a young star.
C) You are in the universe shortly after inflation.
D) You are inside the nucleus of an atom.
E) You are in the early universe before the Planck time.
E
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The period we call the "heavy bombardment" was
A) the first few hundred thousand years of the solar system's history. B) the most recent hundred million years of the solar system's history. C) the first few hundred million years of the solar system's history. D) a period of a few hundred million years that began when the solar system was about 1 billion years old. E) the time during which an asteroid hit the Earth and caused the extinction of the dinosaurs.
The acceleration due to gravity on Titan, Saturn's largest Moon, is about 1.4 m/s2. What would a 60-kg scientific instrument weigh on Titan?
A. 43 N B. 60 N C. 84 N D. 600 N
In globular clusters, the brightest stars will be:
A) massive blue main sequence stars. B) red supergiants. C) T Tauri stars. D) blue stragglers. E) planetary nebulae.
The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons. b. There are 7.8 × 10^13 more protons than electrons. c. There are 3.9 × 10^13 more protons than electrons. d. There are 3.9 × 10^13 more electrons than protons.