How do we know sunspots have magnetic fields?
A. Wien's law
B. the Zeeman effect
C. We have measured the sunspots' fields with spacecraft.
D. the Hubble effect
E. None of these choices is correct.
Answer: B
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The periodic table is most easily understood in terms of the ______________ configurations of the elements
a. periodic b. proton c. neutron d. electron
A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 40 N/C b. 45 N/C c. 24 N/C d. 90 N/C e. 36 N/C
The density wave theory attempts to explain why the spiral arm structure persists over a long time
Indicate whether the statement is true or false
The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (pt/8). What is its period of oscillation?
a. 100 s c. 16 s b. 32 s d. 8.0 s