As more lamps are put into a series circuit, the overall current in the power source
A) increases.
B) decreases.
C) stays the same.
Answer: B
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Velocity Addition: A spaceship traveling at 0.50c away from Earth launches a secondary rocket in the forward direction at 0.50c relative to the spaceship. As measured by Earthlings, how fast is the secondary rocket moving away from Earth?
A. 0.90c B. 0.50c C. 0.80c D. 0.70c E. c
What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high. B) Although dark matter emits no visible light, we have detected its radio emissions. C) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk. D) Our view of distant galaxies is often obscured by dark blotches, which are presumably made of dark matter.
Almost all of our atmospheric gases lie in the:
A) ionosphere. B) stratosphere. C) troposphere. D) ozone layer. E) mesosphere.
What is the magnitude of the magnetic field at point P if a = R and b = 2R?
A.
B.
C.
D.
E.
