A standard candle is
A) a 7-cm-long wax candle.
B) another name for a main-sequence star.
C) another name for a barred-spiral galaxy.
D) a light source of known luminosity.
D
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You drive five blocks due north, five blocks due east, and another two blocks due north. What is the magnitude of your displacement?
A. 7 blocks B. 12 blocks C. 9 blocks D. 10 blocks E. 8.6 blocks
What is Charon?
A) the largest of Pluto's moons B) the largest known Kuiper belt comet C) the largest known asteroid D) a captured moon of Neptune
Elliptical galaxies are more likely to be found in clusters than are spiral galaxies
Indicate whether the statement is true or false
A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A) 30 s B) 15 s C) 45 s D) 4.2 s