A star with the mass of our Sun will go through several stages of energy generation through fusion. Which sequence accurately describes these stages in the correct order?
a. hydrogen core ? hydrogen shell ? helium shell ? helium core
b. hydrogen core ? helium core ? hydrogen shell ? helium shell
c. hydrogen core ? hydrogen shell ? helium core ? helium shell ? carbon core
d. hydrogen core ? hydrogen shell ? helium core ? helium shell
e. hydrogen shell ? hydrogen core ? helium shell ? helium core
d
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Based on current understanding, the minimum mass of a black hole that forms during a massive star supernova is roughly ________
A) 3 solar masses B) 10 solar masses C) 1.4 solar masses D) 0.5 solar masses
Entropy: On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. At what rate is the entropy of the air outside the house changing as a result of this process?
A. +13 W/K B. -25 W/K C. 85 W/K D. +99 W/K E. 0 W/K
About how many stars are visible on a clear, dark night with the naked eye alone?
A) a few dozen B) a few hundred C) a few thousand D) tens of thousands E) millions and millions
Which of the following best describes the most likely internal structure of Europa?
A) thin icy crust, subsurface ocean of water, thick iron mantle, central rocky core B) thin icy crust, subsurface ocean of water, thick rocky mantle, central iron core C) thin icy crust, thick rocky mantle, central iron core D) surface ocean of water, thick rocky mantle, central iron core