If the Earth were represented as a basketball (˜10 in. in diameter) and the Moon as a baseball (˜3 in. in diameter) then, to order of magnitude, what size would best represent the diameter of the Sun?
a. 10 ft
b. 100 ft
c. 1000 ft
d. 10000 ft
b
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In the context of star clusters, which of the following statements is true of the turnoff point?
A) It is the point on the main sequence of a Hertzsprung-Russell diagram that is used to determine the luminosity class of the stars in the cluster. B) Stars at this point are considered to have just taken birth and have 90 percent of their life remaining. C) The life expectancy of the stars at this point is not equivalent to the age of the cluster. D) It is the point on the main sequence of a Hertzsprung-Russell diagram where stars evolve to the right of the H-R diagram to become giants.
What is the Hubble constant essentially a measure of?
a. The number of galaxies in the universe. b. The expansion of the universe. c. The age of the Milky Way galaxy. d. The amount of dark matter in an average galaxy.
A mass of 1.0 kg is pushed against a spring with a spring constant of 25 N/m. As a result, the spring is compressed by 20 cm. The mass is then released. What is the amount of work required to compress the spring?
What will be an ideal response?
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
In what quadrant are both the sine and tangent negative?
A. 1st B. 2nd C. 3rd D. 4th E. This cannot happen.