The interstellar medium is made of ______________
a. gas b. dust
c. gas and dust d. None of these choices are correct.
c
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A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 ?C placed on it. At the center of the shell is placed a point charge of 2.00 ?C. What is the electric field at a distance of 30.0 cm from the center of the spherical shell?
a. 
b. 
c. 
d. 
e. 0.0
Stratification, or ______________, is the layering that develops at the time sediments are deposited
Fill in the blank(s) with correct word
Which of the following statements about types of galaxies is not true?
A) Spiral galaxies have younger stars than elliptical galaxies. B) Among the large galaxies in the universe outside of clusters, most are spiral. C) Large elliptical galaxies are more common in clusters of galaxies than they are outside of clusters. D) Elliptical galaxies are bluer and contain more dust than spiral galaxies.
An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time. Determine the acceleration of the object during this motion.
A. ?1.6 m/s2 B. +6.4 m/s2 C. +1.6 m/s2 D. ?2.0 m/s2 E. ?6.4 m/s2