What is the "cosmological constant?"
a. The universe has existed forever and on the average (over billions of cubic light years) does not change.
b. This is the ratio between "dark energy" and "dark matter.".
c. This is a quantity also referred to as "quintessence.".
d. This is a self-admitted blunder in his theory of general relativity by Einstein, that might not be a blunder after all.
d
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At temperatures above the equi-cohesive temperature, the creep mechanism of grain boundary _________is observed.
Fill in the blank(s) with the appropriate word(s).
A convex spherical mirror with a focal length of magnitude 25 cm has a 4.0-cm tall flower placed 100 cm in front of it. What is the height of the image of the flower?
A) 0.80 cm B) 20 cm C) 4.0 cm D) 1.6 cm E) 8.0 cm
Which element has the atomic number 9?
A) F B) Ne C) B D) Na E) Be
A neutron?
A. A B. B C. C D. D E. zero F. Other G. AA H. BB I. CC J. DD