Balance the chemical equation: Cu + Al2O3 ? CuO + Al
3Cu + Al2O3 ? 3CuO + 2Al
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Why does Jupiter have several distinct cloud layers?
A) Different gases are present at different altitudes in Jupiter's atmosphere. B) Clouds form randomly, so on average there are always several layers. C) Different layers represent the various regions where the temperature is cool enough for liquid water to condense. D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes. E) Different layers represent clouds made of gases that condense at different temperatures.
If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 6.0 nC, what is the magnitude of the electric field at point P in the figure?
a.
65 N/C
b.
55 N/C
c.
60 N/C
d.
52 N/C
e.
67 N/C
If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 3.0 nC in the figure, what is the magnitude of the electric field at point P?
a.
71 N/C
b.
56 N/C
c.
60 N/C
d.
53 N/C
e.
67 N/C
A cone balanced on its small end is in
A) stable equilibrium. B) unstable equilibrium. C) neutral equilibrium. D) positive equilibrium. E) negative equilibrium.