An external heat source supplies heat to a system at a rate of 187 W as the system does work at a rate of 131 W. At what rate is the internal (thermal) energy of the system changing?
A) 320 W B) 56 W C) 190 W D) -56 W E) -320 W
B
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How did oxygen (O2) get into Earth's atmosphere?
A) It was released by life through the process of photosynthesis. B) It was captured from the solar nebula. C) It was outgassed from volcanoes. D) It came from chemical reactions with surface rocks.
What evidence has Chandra found to contradict the hypothesis that black holes merge during galaxy collisions?
A) a double black hole in a single galaxy B) a black hole without a host galaxy C) a hypermassive black hole D) a triple black hole system E) a dwarf galaxy containing a black hole
Atomic Nucleus: Name the first three isotopes of hydrogen, write their symbols in standard notation, and indicate which one is the most common and which one is the most unstable.
What will be an ideal response?
You can find the tilt of Earth's axis by measuring the angle between your horizon and the North Star
Indicate whether the statement is true or false