How many atoms are in one gram of 27 13 Al?
a. 
b. 
c. 
d. 
e. 
e.
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Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of about 4 million solar masses. C) It is a source of x-ray emission that we have observed with telescopes in space. D) It is a source of bright radio emission.
At the critical fiber length in a short fiber composite, the fiber stress at the center of the fiber length is equal to the fiber stress in a _________fiber composite.
Fill in the blank(s) with the appropriate word(s).
Must all physically reasonable wavefunctions remain finite as 
, or does this apply only to solutions to the Schrödinger equation (B)?
A. 
B. Does this apply only to solutions to the Schrödinger equation
What is the common trait of all main-sequence stars?
A) They are all spectral type G. B) They generate energy through hydrogen fusion in their core. C) They all have approximately the same mass. D) They are in the final stage of their lives.