A one-dimensional or line defect in a crystalline material is a(n) _____________.
Fill in the blank(s) with the appropriate word(s).
dislocation
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What evidence do we have that Earth has a molten core?
What will be an ideal response?
If the density of the Universe is ________ than the critical density, then the Universe will ________.
A. larger; expand forever B. larger; eventually collapse in a "Big Crunch" C. less; eventually collapse in a "Big Crunch" D. less; not change in size
The term "dirty bomb" refers to
A) a bomb that uses conventional explosive to disperse radioactive materials. B) a conventional chemical bomb that disperses pieces of metal in order to harm the maximum number of people. C) a nuclear device that is optimized for the release of radioactive materials. D) a nuclear device that releases neutrons in order to kill people without harming buildings and other structures. E) any nuclear device that is used for terrorist purposes.
As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon?
The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2. A) 0.0024 N B) 0.24 N C) 0.024 N D) 0.00024 N