Stars within a cluster that are at the turnoff point
a. have life expectancies that are equal to the age of the cluster.
b. are stars that are just becoming white dwarfs.
c. are stars that are just entering the main sequence portion of their evolution.
d. are stars that are about to supernova.
e. are stars that are generally spectral type G stars.
A
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Exhibit 4-1While her kid brother is on a wooden horse at the edge of a merry-go-round, Sheila rides her bicycle parallel to its edge. The wooden horses have a tangential speed of 6 m/s. Sheila rides at 4 m/s. The radius of the merry-go-round is 8 m.Use this exhibit to answer the following question(s). Refer to Exhibit 4-1. At what time intervals does Sheila encounter her brother, if she rides opposite to the direction of rotation of the merry-go-round?
A. 5.03 s B. 8.37 s C. 12.6 s D. 25.1 s E. 50.2 s
Mercury is larger than Earth's Moon but smaller than Earth
a. True b. False Indicate whether the statement is true or false
Star A has a temperature 3 times that of star B. Both star A and star B are the same physical size. Which statement about star A and star B below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
Light emitted by the Sun is
A) polarized. B) nonpolarized. C) sometimes polarized.