____________ is the separation of material in a newly formed planet or asteroid according to density. This happens when the object becomes molten
a. Accretion
b. Differentiation
c. Condensation
d. Outgassing
e. Sublimation
b
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At last you are in a place where the heat and high density are no longer bothering you. However, although the density is very low, the gas around you is extremely high in temperature
In fact, the temperature is so high that it is emitting lots of X-rays, which are creating cancer-causing mutations in your body at a rapid rate. Well, at least the view is great! There are no stars anywhere within about 10,000 light-years of you, but at slightly greater distances your sky is brightened by many beautiful, star-filled structures, some with majestic spiral shapes. Where are you? A) You are in the universe when it was about 200 million years old, just before galaxies began forming. B) You are in the center of the Milky Way Galaxy, looking outward into the Local Group. C) You are somewhere between the Andromeda and Milky Way galaxies in the Local Group. D) You are in intergalactic space within a rich cluster of thousands of galaxies. E) You are in the outskirts of a galaxy whose nucleus is a powerful quasar.
What are the two geological features that appear to set Earth apart from all the other terrestrial worlds?
A) plate tectonics and a high level of erosion B) a dense core and plate tectonics C) significant volcanism and tectonics D) mantle convection and a thick atmosphere
Two objects approach each other with velocities such that the total momentum of the masses is zero kg?m/s, and undergo an elastic collision. Is the sum of the kinetic energies of each object the same before and after the collision?
What will be an ideal response?
An electron and a positron, each having kinetic energy 1.843 GeV, annihilate, producing a proton and antiproton pair (M = 938.3 MeV/c2). What is the kinetic energy of the antiproton produced in this way?
A. 0.938 GeV B. 0.905 GeV C. 1.586 GeV D. 1.843 GeV