The cores of the Moon and Mercury are similar in that
A) both cores are more iron rich than the rest of the body and the core is solid throughout.
B) both cores are large in proportion to the object with a solid inner core and fluid outer core.
C) both cores are more iron rich than the rest of the body, with a solid inner core and fluid outer core.
D) both cores are small in proportion to the object, with a fluid inner core and solid outer core.
C
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The Crab Nebula is a bright, long-lasting supernova remnant that was made by a ________ supernova
Fill in the blank(s) with correct word
The primary source of the Sun's energy is:
A) oxidation of carbon in the core. B) gravitational collapse of the helium coreward. C) dark energy. D) the strong force fusing hydrogen into helium. E) the weak force creating energy from uranium decay.
The average speed of stars relative to the Sun in the solar neighborhood is about 20 km/s. Suppose you discover a star in the solar neighborhood that is moving relative to the Sun at a much higher speed, say, 200 km/s
What kind of orbit does this star probably have around the Milky Way? In what part of the galaxy does it spend most of its time? Explain.
A 10-V battery is connected to a 15-? resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-? resistor in 2.0 min?
a.
0.40 kJ
b.
0.19 kJ
c.
0.29 kJ
d.
0.72 kJ
e.
0.80 kJ