Why is the Moon's surface cratered but Earth's is not?
A. When the dinosaurs died, their remains filled all Earth's craters.
B. The Moon's stronger magnetic field attracted more iron asteroids.
C. Meteors bounce off Earth's atmosphere.
D. Earth's impact craters have been mostly obliterated by erosion and plate tectonics.
Answer: D
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Why can't the Moon always pass through the center of the umbra? a. The Moon's rotation is slightly faster than its revolution around Earth. b. The Moon's orbit is inclined by 5 degrees to the plane of Earth's orbit. c. The Moon's synodic cycle changes a few minutes per cycle
d. The Moon's orbit changes with the seasons. e. The Moon is not in its full moon lunar phase.
Compared to an open cluster, a globular cluster will have more hot, blue stars
Indicate whether the statement is true or false
Where on the celestial sphere would you look for the planets?
A. in the zodiac (near the ecliptic)
B. on the galactic equator
C. at the north celestial pole
D. on the celestial equator
Preston pushes a wheelbarrow weighing 500 N to the top of a 50.0-m ramp, inclined at 20.0° with the horizontal and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which a 60.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)
a. 5550 J c. 8150 J b. 6550 J d. 13,100 J