In the aluminum-nickel phase diagram in Figure 5.15, what is the reaction type that leads to the formation of Al3Ni at 854°C? _____________
Fill in the blank(s) with the appropriate word(s).
Peritectic
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What force(s) are responsible for the collapse of an interstellar cloud?
a. nuclear b. gravity c. electric d. magnetic e. electric and magnetic
The greenhouse effect keeps Venus hot because
a. the atmosphere contains free oxygen. b. the atmosphere is predominently carbon dioxide. c. the surface converts infrared into visible radiation. d. the surface is free of sulfur compounds. e. the magnetic field traps a large number of particles from the solar wind.
In a region where the electric field is uniform and points in the +x direction, the electric potential is -2000 V at x = 8 m and is +400 V at x = 2 m. What is the magnitude of the electric field?
A) 200 V/m B) 300 V/m C) 400 V/m D) 500 V/m E) 600 V/m
What is one advantage that primates have over other forms of life?
A) the ability to run fast B) extra-large brains C) the opposable thumb D) the ability to walk upright