If we could see our own galaxy from 2 million light-years away, it would appear ________
A) as a faintly glowing band of light stretching all the way around the sky
B) like a single, dim star
C) as a flattened disk with a central bulge and spiral arms
D) to fill the sky with widely spaced stars
C
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A(n) ____ is well supported (observationally and/or experimentally) system of rules and principles that can be applied to a wide variety of circumstances
a. hypothesis b. paradigm c. theory d. model
An electron moving in the +y direction, at right angles to a magnetic field, experiences a magnetic force in the -x direction. The direction of the magnetic field is in the
A) -x direction. B) +x direction. C) +y direction. D) -z direction. E) +z direction.
Fusion processes in stellar cores involving heavy elements ____
a. generate more energy per atom than fusion of lighter elements b. generate less total energy because less atoms are available c. generate energy for longer periods of time for heavier elements d. occur in shells further and further from the center of the core e. occur in larger and larger volumes of the core
When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is:
a. 0.25 b. 0.50 c. 1 d. 2 e. 4