In looking at yourself in a steamy mirror you wipe just enough moisture away to barely see a full view of your face. If you move back from the mirror you'll see
A) a bit more of your face.
B) a bit less of your face.
C) the same amount of your face.
Answer: C
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Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?
A) Within individual galaxies, dark matter is always concentrated near the galactic center, and within clusters it is always concentrated near the cluster center. B) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster. C) Dark matter is present between galaxies in clusters, but not within individual galaxies. D) Dark matter is the dominant form of mass in both clusters and in individual galaxies.
A helicopter is traveling at 54 m/s at a constant altitude of 100 m over a level field. If a wheel falls off the helicopter, with what speed will it hit the ground? Note: g = 9.8 m/s2 and air resistance is negligible
a. 40 m/s c. 60 m/s b. 50 m/s d. 70 m/s
What astronomical object is the most important source for determining the age of our Solar System?
a. lunar rocks b. Earth core samples c. meteorites d. meteors e. asteroids
How do we know that halo stars are older, on average, than disk stars?
A) Halo stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue halo stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the halo formed earlier than the disk. E) We see evidence for new stars forming in the disk today.