The cluster of galaxies that includes our Milky Way is called the _______________
a. Local Group
b. universe
c. solar system
d. Milky Cluster
a
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Refracting Telescope: The length of the telescope is 1.60 m, and it has a magnification of 60.0. What is the focal length of the objective lens?
A. 60.0 cm B. 157 cm C. 100 cm D. 128 cm E. 96.0 cm
The waveform of interfering waves is described by the principle of ______________
Fill in the blank(s) with correct word
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision
a. 15 m/s b. 7.0 m/s c. 8.0 m/s d. 23 m/s e. 11 m/s
For finding the distance to M31, Hubble relied upon
A) planetary nebulae near its core. B) Cepheid variables in its spiral arms. C) Type I supernova in its core. D) Type II supernova in its spiral arms. E) RR Lyrae stars in its globular clusters.