Earth's atmosphere is opaque to waves that are concentrated in the
A) infrared part of the spectrum.
B) visible part of the spectrum.
C) entire electromagnetic spectrum.
Answer: A
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_______________ variable stars are useful in measuring the distance to globular clusters
Fill in the blank(s) with correct word
The circular velocity of a satellite orbiting Earth is given by 
. In this equation,
M represents the mass of the satellite, and r is its radius.
M represents the mass of Earth, and r the radius of Earth.
M represents the mass of the satellite, and r the distance from Earth to the satellite.
M represents the mass of Earth, and r the distance from Earth to the satellite.
M represents the mass of the satellite, and r the distance from Earth's surface to the satellite.
Which of the following is typical of a Jovian planet?
A. an orbit inside the asteroid belt B. a hydrogen-poor composition C. the presence of many moons D. an average density about that of rock E. evidence for volcanic activity
As a system becomes more disordered, entropy
A) increases. B) decreases. C) remains the same.