From a fracture mechanics viewpoint, the reason freshly drawn glass fibers are stronger than window glass is that window glass has _________ that decrease its strength.
Fill in the blank(s) with the appropriate word(s).
cracks or defects
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An 18-wheeler and a Volkswagon Beetle are rolling along with the same momentum. If you exert the same force with the brakes to stop each one, which takes a longer time to bring to rest?
A. 18-wheeler B. Volkswagon beetle C. same for both D. impossible to say
Which event in the history of the universe happened last?
A) Stable helium nuclei formed. B) The electroweak force separated into electromagnetic and weak nuclear forces. C) The GUT force separated into the electroweak force and strong force. D) Neutral atoms formed.
From the best current data, we infer the universe will expand forever
Indicate whether the statement is true or false
In the text there is a table of coefficients of linear (?) and volume (?) expansions due to temperature changes. For the solid materials in this list, there is a relationship between ? and ? which allows you to find the value of ? if you know ?. Which of the following best describes that relationship?
a. ? = ?3 b. 3? = ? c. ? = 3? d. ?3 = ?