The _________material in a composite is continuous and surrounds the reinforcing phase of particles or fibers.
Fill in the blank(s) with the appropriate word(s).
matrix
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Discuss the Miller-Urey experiment. What did these scientists had set out to prove?
What will be an ideal response?
Two wires A and B with circular cross sections are made of the same metal and have equal lengths, but the resistance of wire A is three times greater than that of wire B. What is the ratio of the cross-sectional area of A to that of B?
1.3 2.?3 3.1 4.1/?3 5.1/3
which of the following is true for the monuments built by ancient civilization?
A. they are based on stars. B. they are based on change in the alludes of sun during seasonal changes. C. the apex of these monuments pointed to stars. D. the geometry and architecture are based on the heavenly bodies e. all of the above
Observationally, a key distinction between a white dwarf supernova and a massive-star supernova is that the spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white dwarf supernova does not. Why don't we see prominent hydrogen lines in the spectrum of a white dwarf supernova?
A) White dwarf supernovae occur so far away that their hydrogen lines become too dim to see. B) During a white dwarf supernova, all the white dwarf's hydrogen fuses instantly to make helium. C) White dwarfs are stellar corpses that contain little or no hydrogen, so they do not show hydrogen lines when they explode. D) The hydrogen lines of white dwarf supernovae are so redshifted that we cannot detect them.