Cepheid variables are useful in measuring the distance to ____
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther
b. globular clusters and the Andromeda Galaxy, but not more distant objects
c. galaxies that are within 30 megaparsecs, a relatively short distance
d. galaxies that are moderately far away, up to about 500 megaparsecs
e. galaxies and galactic clusters within a gigaparsec of the Milky Way
c
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Suppose you receive a message from a starbase that is 13.0 light-years from earth. The message is dated July 15, 2127. What year does your calendar indicate at the time of reception if your calendar and the station’s calendar are correctly synchronized?
A. 2127 B. 2114 C. 2140 D. Other (specify)
Any compact object with a mass greater than _______________ solar masses must form a black hole
Fill in the blank(s) with correct word
Mass on a Spring: A 0.50-kg object is attached to an ideal spring of spring constant (force constant) 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position. At what distance from the equilibrium position are the kinetic energy and potential energy of the system the same?
A. 0.017 m B. 0.029 m C. 0.12 m D. 0.17 m
Jupiter does not have
a. a hot interior. b. convection occurring in its atmosphere. c. crustal plates on its surface. d. a dynamo effect. e. any rings.