What is the equivalent resistance between points A and B in the figure when R = 20 ??
a.
77 ?
b.
63 ?
c.
70 ?
d.
84 ?
e.
140 ?
c
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Phobos and Deimos are believed to be captured ____
a. comets b. planetesimals c. planetoids d. asteroids e. meteorites
Which of these shows one cycle of the wave?
a. 
b. 
c. 
d. 
Which of the following hypothetical observations would demonstrate that the inflation model was incorrect?
A) The geometry of the universe is curved, not flat. B) The helium abundance in a galaxy is 29%. C) The rate of expansion of the universe has changed over time. D) Stars began to shine only a few hundred million years after the Big Bang.
Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular velocities of the point
a. Both are constant. b. Only the angular velocity is constant. c. Only the linear velocity is constant. d. Neither is constant.