If a nucleus had a diameter of 8.0 fm, what would be its expected mass, in atomic mass units?
A) 128 u B) 7 u C) 296 u D) 37 u E) 64 u
D
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When the equation H2O + NO2 ? NO + HNO3 is balanced, the sum of all the coefficients (both written and "understood") is ______________
Fill in the blank(s) with correct word
Large meteoroids are thought to collide with Earth:
A) at least once a decade. B) about once a century. C) a few times in every million-year period. D) once every billion years. E) never; only comets are thought to collide with Earth.
In the figure, if a = 2.0 cm, b = 4.0 cm, and I = 2.0 A, what is the magnitude of the magnetic field at point P?
a.
49 ?T
b.
39 ?T
c.
50 ?T
d.
69 ?T
e.
13 ?T
If the earth's electric field is 100 N/C downward, what must be the charge on a 1-kg object so that it would be "weightless"?
A) 9.8 C B) 0.22 C C) 1.0 C D) -9.8 × 10-2 C E) 9.8 × 10-2 C