Density waves may explain
A) the lack of blue stars in the halo.
B) the random orbits of halo stars.
C) the density of red stars in the bulge.
D) the spiral arm structure of the Galaxy.
E) the large number of open clusters in the halo.
D
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Isotropy is the observation that, in its general properties, the Universe looks different in every direction
Indicate whether the statement is true or false
In order to predict whether a star will eventually fuse oxygen into a heavier element, what do you need to know about the star?
A) its luminosity B) its overall abundance of elements heavier than helium C) how much oxygen it now has in its core D) its mass
Rocks are found on the surface of another planet which appear to have been formed from the solidification of molten lava. Given this, they are most likely to be classified as
A) meteoritic B) metamorphic C) sedimentary D) igneous
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV