The more massive star in a binary system is always farthest from the center of mass
Indicate whether the statement is true or false
F
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A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-? load resistor?
a.
0.32 A
b.
0.34 A
c.
0.37 A
d.
0.39 A
e.
0.43 A
Angular momentum cannot be conserved if
A) the angular acceleration changes. B) the angular velocity changes. C) there is a net force on the system. D) the moment of inertia changes. E) the net torque is not zero.
Applications to Astronomy: Estimate the observed wavelength for the 656 nm line in the spectrum of a star which is 100 million light-years from us if H = 20 
? (c = 3.00 × 108 m/s)
A. 620 nm B. 640 nm C. 660 nm D. 690 nm
Which of the following is not true of the fossil record?
A) The fossil record spans 3 billion years of Earth's 4.6 billion year age. B) The most common fossils are from organisms that had hard parts like shells and bones. C) Similar to present day stromatolites, the first fossils were simple, anaerobic algal plants. D) The Paleozoic era is credited with the emergence of life.