1020 steel contains _________weight percent carbon.
Fill in the blank(s) with the appropriate word(s).
0.20
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The contact angle for a water droplet on wax is 112°. Assume that the surface tension for wax 0.023 N/m. What is the value of the interfacial tension between water and wax at 25°C?
What will be an ideal response?
When a meteor strikes Earth's surface, it is called a(n) ______________
a. asteroid b. star c. planet d. meteorite e. ball
Tracks, borings, and burrows are examples of
a. replaced remains. b. index fossils. c. trace fossils. d. microfossils.
A radioactive isotope has a half-life of one month. At the end of one month, the amount of the original isotope still remaining is
1) none, 2) one-quarter, 3) one-half, 4) three-fourths, and at the end of two months, the amount of original isotope remaining is 5) none. 6) one-fourth. 7) one-half. 8) three-fourths.