An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
D
Physics & Space Science
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An ideal gas is allowed to expand adiabatically. Assume the process is reversible. What is the change in entropy?
A. 0 B. nR ln (V2/V1) C. nR ln (T2/T1) D. kn ln (V2/V1) E. kn ln (T2/T1)
Physics & Space Science
To prevent a home electric circuit from overheating because of too much current, a(n) ______________ is used
Fill in the blank(s) with correct word
Physics & Space Science
A 3rd magnitude star is 3 times brighter than a 1st magnitude star
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
If you wanted to observe stars behind a molecular cloud, in what wavelength of light should you observe?
A) ultraviolet B) visible C) infrared D) x-ray E) gamma ray
Physics & Space Science