Rotation, Equivalence Principle, and GP-B Experiment
  The ultra-precise Gravity Probe B experiment measured the frame-dragging
effect and geodetic precession on four quartz gyros. We use this result to test
WEP II (Weak Equivalence Principle II) which includes rotation in the universal
free-fall motion. The free-fall E\"otv\"os parameter eta for rotating body is <
= 10**(-11) with four-order improvement over previous results. The anomalous
torque per unit angular momentum parameter lambda is constrained to (-0.05 +-
3.67) \times 10**(-15) s-1, (0.24 +- 0.98) \times 10**(-15) s-1, and (0 +- 3.6)
\times 10**(-13) s-1 respectively in the directions of geodetic effect,
frame-dragging effect and angular momentum axis; the dimensionless
frequency-dependence parameter {\kappa} is constrained to (1.75 +- 4.96) \times
10**(-17), (1.80 +- 1.34) \times 10**(-17), and (0 +- 3) \times 10**(-14)
respectively.
