Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
A) The higher density of gas has a stronger force of gravity, and therefore the cloud collapses more quickly.
B) The thickness of the dense cloud prevents a disk from forming.
C) The higher gas density forms stars more efficiently, so all the gas is converted into stars before a disk can form.
D) The force of gravity can pull the material into a more spherical shape.
E) The more frequent collisions between particles randomize the particle orbits.
C
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A flywheel's diameter is twice that of another of the same shape and mass. Rotational inertia of the larger flywheel is
A) two times greater. B) four times greater. C) the same as the other's. D) half.
A current-carrying loop of wire experiences no tendency to rotate in a magnetic field when
A) field lines pass directly through the loop. B) no field lines pass through the loop. C) none of these
The magnetic field produced by a long straight current-carrying wire is
A) proportional to both the current in the wire and the distance from the wire B) proportional to the current in the wire and inversely proportional to the distance from the wire. C) inversely proportional to the current in the wire and proportional to the distance from the wire. D) inversely proportional to both the current in the wire and the distance from the wire. E) independent of both the current in the wire and the distance from the wire.