If an atom were the size of a baseball, its nucleus would be about the size of a(n)
A) walnut.
B) raisin.
C) flea.
D) atom.
Answer: C
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The length of the arrow representing an object’s four-momentum on an energy–momentum diagram is directly proportional to
A. The four-momentum’s four-magnitude 
.
B. The relativistic momentum’s magnitude 
.
C. The object’s mass.
D. The object’s speed.
E. The object’s inverse speed.
F. None of the above.
You want to determine whether a mystery object is a neutron star or a white dwarf. Which of the following properties would demonstrate that it is definitely a neutron star?
A) It emits most strongly in visible and ultraviolet light. B) It is surrounded by a planetary nebula. C) Every decade or so, it erupts in a nova explosion. D) It dims and brightens more than twice per second.
A uniform linear charge of 2.0 nC/m is distributed along the x axis from x = 0 to x = 3 m. Which of the following integrals is correct for the x component of the electric field at y = 2 m on the y axis?
A.
B.
C.
D.
E.
Sunspots are ________ poles in the photosphere
Fill in the blank(s) with correct word