The depth to which an inverted drinking glass must be pushed beneath the water surface to squeeze the enclosed air to half its volume is
A) 76 cm.
B) 10.3 m.
C) 14.7 m.
D) 20.6 m.
E) 29.4 m.
Answer: B
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A rectangle has a length of 1.323 m and a width of 4.16 m. Using significant figure rules, what is the area of this rectangle?
a. 5.50368 m2 b. 5.5037 m2 c. 5.504 m2 d. 5.50 m2 e. 5.5 m2
What does it mean for an atom to be ionized?
a. An atom is only considered ionized if it has *fewer* bounded electrons than protons, causing it to have a net positive charge. b. An atom is only considered ionized if it has *more* bounded electrons than protons, causing it to have a net negative charge. c. An atom is only considered ionized if it has more or fewer bounded electrons than protons, causing it to have a non-zero charge. d. An atom is only considered ionized if it has the same number of bounded electrons and protons, causing it to have a neutral, or net zero charge.
Recent work with type I supernovae at great distances suggests the universe may in fact be accelerating its expansion, a discovery attributed to a newly found:
A) repulsive charge on dark matter. B) polarization and a universal spinning magnetic field. C) dark energy. D) magnetic field associated with antimatter. E) mass determined for the neutrinos.
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
a.
5.0 N
b.
4.4 N
c.
3.8 N
d.
5.7 N
e.
0.60 N