What is one idea why a relatively dense protogalactic cloud more likely to produce an elliptical galaxy than a spiral galaxy?
A) The force of gravity from the higher gas density can pull the material into a more spherical shape.
B) The more frequent collisions between particles in the high-density gas randomize the particle orbits.
C) The thickness of the dense cloud prevents a disk from forming.
D) The higher gas density allows more rapid star formation, leaving little gas to form a disk.
D) The higher gas density allows more rapid star formation, leaving little gas to form a disk.
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Answer the following statement(s) true (T) or false (F)
1. A given object always has a specific moment of inertia I, independent of the axis around which it rotates (as long as the axis goes through the object’s center of mass). 2. An isolated star collapses so that its radius is half its original radius. Both its angular momentum and its rotational energy must be conserved.
Fusing two iron nuclei would occur with
A) absorption of energy. B) release of energy. C) neither of these
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below
A) James reaches the surface of the lake first. B) John reaches the surface of the lake first. C) James and John will reach the surface of the lake at the same time. D) Cannot be determined without knowing the mass of both James and John. E) Cannot be determined without knowing the weight of both James and John.
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
A. 9.9 mm B. 1.1 cm C. 1.3 cm D. 1.4 cm E. 7.6 mm