Most of the elements heavier than iron that are spread throughout the dust of the universe were created
A) in hot white dwarf stars.
B) during the fusion process that powers the stars, and then released in supernova explosions.
C) in the original creation of the universe.
D) in college cafeterias.
E) during the shock of a supernova explosion.
E
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Determine the energy stored in C2 when C1 = 15 ?F, C2 = 10 ?F, C3 = 20 ?F, and V0 = 18 V
a.
0.72 mJ
b.
0.32 mJ
c.
0.50 mJ
d.
0.18 mJ
e.
1.60 mJ
As discussed in the Extraordinary Claims box, when the giant impact idea was first proposed, it was generally thought to be so unlikely that it wasn’t seriously considered until decades later, after the Apollo missions to the Moon. What key piece of scientific understanding was missing that made it seem so unlikely when first proposed?
a. An understanding of the number and size of leftover planetesimals in the early solar system. b. An understanding of how heavily cratered the Moon’s surface is. c. A precise age for the solar system. d. An understanding of the difficulty of gravitationally capturing a body as large as our Moon.
What is a planetary nebula?
A) The bipolar jets ejected by a T Tauri variable B) A planet surrounded by a glowing shell of gas C) The disc of gas and dust surrounding a young star that will soon form a solar system D) The ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant E) A type of young, medium mass star
If two adjacent frequencies of an organ pipe closed at one end are 500 Hz and 700 Hz, what is the length of the organ pipe? (vsound = 340 m/s)
a. 0.85 m c. 1.50 m b. 1.25 m d. 1.70 m