What information do scientists use to estimate the total mass of the Milky Way Galaxy?
a. The size of the galaxy from end to end.
b. The number of stars and planets thought to be in the galaxy.
c. The mass of Earth.
d. The diameter of the galaxy.
e. The fact that all the stars in the galaxy rotate about a common point.
e
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Distinguish between solvent and solute
The ripple frequency of a bridge rectifier is
a. double the input frequency. b. the same as the input frequency c. triple the input frequency. d. quadruple the input frequency.
A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. the wire is moved perpendicularly to the field. c. neither wire nor magnet is moving. d. the wire's axis is parallel to the field.
Where is the Sun located in the Milky Way?
A. In an open cluster in the bulge. B. At the center of the Milky Way. C. In a globular cluster in the halo. D. In a star forming region in the halo. E. About 2/3 of the way out in the disk.