Under what conditions is an object weightless?
What will be an ideal response?
whenever it is in free-fall
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In the BCC lattice, the interstitial site with coordinates ½,1,½ is called a(n) _____________site.
Fill in the blank(s) with the appropriate word(s).
Compared to the mass of a hydrogen atom, the mass of an oxygen atom is
A) 8 times as great. B) 12 times as great. C) 16 times as great. D) appreciably more than 16 times as great.
In the time between two closest approaches to Earth, Venus rotates almost exactly five times relative to the Sun. The consequence of this is that:
A) Earth always presents the same face to Venus at inferior conjunction. B) Venus always presents the same face to Earth at inferior conjunction. C) Venus presents the opposite hemisphere to Earth at each inferior conjunction. D) Venus presents the opposite hemisphere to Earth at each superior conjunction. E) Venus' rotation is completely unrelated to the distant Earth.
Halley's Comet returns about every ______________ years
a. 4 b. 12 c. 1000 d. 10,000 e. 76