Which of the following statements comparing open and globular star clusters is true?
A) Stars in open clusters are relatively young, while stars in globular clusters are very old.
B) Open clusters are found both in the disk and the halo of the galaxy, while globular clusters are found only in the halo.
C) Globular clusters typically contain a few hundred stars, while open clusters typically contain tens to hundreds of thousands of stars.
D) Open clusters contain only main-sequence stars, while globular clusters contain only giants.
A) Stars in open clusters are relatively young, while stars in globular clusters are very old.
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The Earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How distant is the star, in ly? (1 ly = 9.46 × 1015 m)
A) 0.13 ly B) 1.3 ly C) 13 ly D) 130 ly E) 1300 ly
The graphs below represent current and voltage phasors at one instant of time. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax.Which graph shows the correct relationship between current and voltage phasors for an inductor in an RL circuit?
a.
b.
c.
You are a passenger on a spaceship. As the speed of the spaceship increases, you would observe that
A) the length of your spaceship is not changing. B) the length of your spaceship is getting shorter. C) the length of your spaceship is getting longer.
Cold-dark-matter models predict:
A) large-scale filaments containing both normal matter and dark matter. B) no structure on a smaller scale than superclusters. C) the universe is less than 10 billion years old. D) dense regions of the early universe that led to galaxies formed after decoupling. E) that dark matter is the largest component of the universe's density.