The universe as a whole is
A) curved.
B) flat.
C) the shape of a saddle.
D) has yet to be determined, although most astrophysical data points to a flat universe.
Answer: D
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The potential energy for the formation of a hydrogen molecule can be approximated by U = -A + BR + C/R, where R is the nuclear separation. Given that A = -78.5 eV, B = 2.57 × 1011 eV/m , and C = 1.44 × 10-9 eV?m
At what nuclear separation is the potential energy a minimum? A) 1.9 × 10-11 m B) 3.7 × 10-10 m C) 7.5 × 10-11 m D) 2.9 × 10-11 m E) 5.1 × 10-10 m
The pressure of an interstellar gas cloud depends on the cloud's ____________________ and ____________________
Fill in the blank(s) with correct word
Measurements of the magnetic field of Venus reveal that the
a. planet has a large iron core. b. interior of the planet is molten. c. planet has no detectable magnetic field. d. planet rotates backwards. e. magnetic field is responsible for large auroral displays (northern lights) on Venus.
How much brighter is a Sun-like star than the reflected light from a planet orbiting around it?
A) a hundred times brighter B) a thousand times brighter C) ten thousand times brighter D) a million times brighter E) a billion times brighter