The visible star nearest the Sun,__________, has a parallax of only 0.76 arc seconds
A) Procyon
B) Epsilon Indi
C) Sirius
D) Alpha Centauri
D
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Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?
A) The maria formed after the heavy bombardment ended. B) The maria formed within the past 1 billion years. C) The regions of the maria were hit by fewer impacts than the densely cratered regions. D) Erosion affects the maria more than it affects other regions of the Moon.
Suppose we wanted to represent all of these objects using the 1-to-10-billion scale from Chapter 1, on which the Sun is about the size of a grapefruit. Approximately how large in diameter would the star Aldebaran be on this scale?
A) 40 centimeters (the size of a typical beach ball) B) 6 meters (roughly the size of a dorm room) C) 15 meters (roughly the size of a typical house) D) 130 meters (slightly larger than a football field)
The total energy emitted by the brightest nova explosions is about:
A) 1,000 Suns. B) 50,000 Suns. C) a million Suns. D) a billion Suns. E) a trillion Suns.
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed form the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^?6 (°C)?1.)
a. 0.079 3 cm2 b. 0.159 cm2 c. 0.238 cm2 d. 0.841 cm2 e. 0.921 cm2