_________hardening is the least expensive process for strengthening metals, because no expensive alloy elements are added, and it is only necessary to deform the metal with standard deformation processes.
Fill in the blank(s) with the appropriate word(s).
Strain
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Which of the following is most likely to occur when an observer finds a star moving perpendicular to his or her line of sight?
A) Neither a blueshift nor a redshift occurs. B) Only a blueshift occurs. C) Only a redshift occurs. D) Both a blueshift and a redshift occur.
Energy in Nuclear Reactions: Consider the nuclear reaction: 7Li + 1p ? 4He + 4He. The known atomic masses are7Li: 7.016005 u
He: 4.002603 u1p: 1.007825 uWhat is the Q-value (or reaction energy) of this reaction? (1 u = 931.5 MeV/c2)
A. 13.57 MeV B. 15.37 MeV C. 17.35 MeV D. 17.53 MeV
When initially discovered by Voyager 2, Neptune's rings appeared as ring arcs, and are more clumpy and less regular than most other rings
Indicate whether the statement is true or false
The heavy bombardment phase of the solar system lasted
A) several million years. B) several tens of millions of years. C) several hundreds of millions of years. D) about a billion years. E) to the present time.