Most of the galaxies in the Local Group are
A) small spirals like M33 and the LMC.
B) active galaxies like Centaurus A.
C) small ellipticals like the companions to M31 in Andromeda.
D) big spirals like our Galaxy and M31.
E) small irregulars like the Magellanic Clouds.
C
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What process has shaped Earth's surface more than any other?
A) impact cratering B) wind erosion C) acid rain D) volcanism E) plate tectonics
Sound will be louder when a struck tuning fork is held
A) in the air. B) with its base against a tabletop. C) with its prongs in shallow water. D) in your closed fist.
Which of the following protogalactic clouds is most likely to form an elliptical galaxy?
A) a very low-density cloud with very little angular momentum B) a dense cloud with very little angular momentum C) a low-density cloud with quite a bit of angular momentum D) a very massive cloud with any density and a lot of angular momentum
As part of an exercise program, a woman walks south at a speed of 2.00 m/s for 60.0 minutes. She then turns around and walks north a distance 3000 m in 25.0 minutes (a) What is the woman's average velocity during her entire motion?
A) 0.824 m/s south B) 1.93 m/s south C) 2.00 m/s south D) 1.79 m/s south E) 800 m/s south (b) What is the woman's average speed during her entire motion? A) 0.824 m/s B) 1.93 m/s C) 2.00 m/s D) 1.79 m/s E) 800 m/s What will be an ideal response?