If not a single solid sheet, then the ring system of Saturn is best described as:
A. rapidly expanding gas with various different chemical compositions.
B. randomly moving particles that will soon disperse in all directions.
C. individually orbiting particles that are clustered around certain orbits.
D. just an illusion.
E. randomly moving particles that frequently collide, so that the force of collision quickly pushes the rings apart.
Ans: C. individually orbiting particles that are clustered around certain orbits.
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Suppose we observe a source of X-rays that varies substantially in brightness over a period of a few days. What can we conclude?
A) The X-ray source is a quasar. B) The X-ray source contains a black hole with an accretion disk. C) The X-ray source is no more than a few light-days in diameter. D) The X-ray source must have a strong, rapidly varying magnetic field. E) We are seeing the rapid orbit of two stars in a binary system.
The term observable universe refers to ________
A) the portion of the universe that is not hidden from view by, for example, being below the horizon B) that portion of the universe that we have so far photographed through telescopes C) that portion of the universe that we can see in principle, given the current age of the universe D) the portion of the universe that can be seen by the naked eye
A metal sphere of radius 2.0 cm carries a charge of 3.0 ?C. What is the electric field 6.0 cm from the center of the sphere?
What will be an ideal response?
A proton, which moves perpendicular to a magnetic field of 1.4 T in a circular path of radius 0.074 m, has what speed? (qp = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg)
a. 7.3E+5 m/s b. 2.8E+7 m/s c. 5.1E+6 m/s d. 9.9E+6 m/s e. 3.9E+6 m/s