The critical temperature the core must reach for a star to shine by fusion is:
A) 5,800 K.
B) 11,000 K.
C) 127,000 K.
D) 10 million K.
E) 100 million K.
D
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What is a key limitation to traveling outside our Solar System in search for life? a. We have the wrong type of fuel source to power a spacecraft
b. We lack spacecraft that can escape Earth's gravity. c. We lack a decent place to send spacecraft outside of our Solar System. d. We have no way to communicate with an alien civilization. e. We have not yet been able to develop the technology to travel far distances.
Many meteorites appear to have formed very early in the solar system's history. How do these meteorites support our theory about how the terrestrial planets formed?
A) The meteorites sizes are just what we'd expect if metal and rock condensed and accreted as our theory suggests. B) The meteorites appearance and composition is just what we'd expect if metal and rock condensed and accreted as our theory suggests. C) Their overall composition is just what we believe the composition of the solar nebula to have been: mostly hydrogen and helium. D) Their appearance and composition matches what we observe in comets today, suggesting that meteorites were once pieces of icy planetesimals.
___________ in other galaxies should contain luminous O and B stars if they are like the Milky Way
a. The halos b. The bulges c. The spiral arms d. The globular clusters e. The coronas
Impedance: A 120-V rms voltage at 60 Hz is applied across an inductor and a 200-? resistor. If the impedance of this circuit is 216 ?, what is the rms value of the current?
A. 0.336 A B. 0.446 A C. 0.556 A D. 0.667 A E. 0.767 A