Which of the following best describes the orbits of stars in the halo?
A) Halo stars have orbits confined to a relatively thin plane.
B) Halo stars have elliptical orbits, with random orientations.
C) Halo stars have elliptical orbits, but all orbiting in the same direction.
D) Some halo stars orbit around the galactic center but others never pass through the plane of the galactic disk.
E) Halo stars orbit the centers of their globular clusters, but do not orbit the center of the galaxy.
B) Halo stars have elliptical orbits, with random orientations.
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The axis of a long hollow metallic cylinder (inner radius = 1.0 cm, outer radius = 2.0 cm) coincides with a long wire. The wire has a linear charge density of ?8.0 pC/m, and the cylinder has a net charge per unit length of ?4.0 pC/m. Determine the magnitude of the electric field 3.0 cm from the axis.
A. 5.4 N/C B. 7.2 N/C C. 4.3 N/C D. 3.6 N/C E. 2.4 N/C
Contrast observation of ionized and neutral hydrogen in space
What will be an ideal response?
A particle of kinetic energy 50 eV in free space travels into a region with a potential well of depth 40 eV. What happens to its speed?
A) It remains the same. B) It increases in the region of the well. C) It decreases in the region of the well. D) It cannot be determined from the information given.
In a standing wave, not necessarily at the fundamental frequency, on a string of length L, the distance between nodes is
a. l/4. b. l/2. c. l. d. L/4. e. L/2.