What are the two main differences between extrasolar planetary systems discovered to date and our Solar System?
A) extrasolar planets tend to be more massive and dense than Jupiter
B) extrasolar planet orbits tend to be more eccentric and inclined than in our Solar System
C) extrasolar planet orbits tend to be closer and more eccentric than in our Solar System
D) extrasolar planet orbits tend to be closer and more circular than in our Solar System
E) extrasolar planets tend to be bigger and denser than Jupiter
C
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An optical fiber is 1.0 meter long and has a diameter of 20 ?m. Its ends are perpendicular to its axis. Its index of refraction is 1.30
What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end? A) 84,000 B) 42,000 C) 26,000 D) 24,000 E) 18,000
When an artery gets a constricted region due to plaque, how does the pressure in this region compare to the pressure in an unconstricted region adjacent?
a. Since this is a closed system, the pressure is the same in both regions. b. In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in an increased pressure. c. In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in a decreased pressure. d. In the constricted region the blood moves at a lower speed than in the unconstricted region resulting in an increased pressure.
Identical particles are placed at the 50-cm and 80-cm marks on a meter stick of negligible mass. This rigid body is then mounted so as to rotate freely about a pivot at the 0-cm mark on the meter stick. If this body is released from rest in a horizontal position, what is the angular speed of the meter stick as it swings through its lowest position?
a. 4.2 rad/s b. 5.4 rad/s c. 4.6 rad/s d. 5.0 rad/s e. 1.7 rad/s
According to the nebular theory, as an interstellar cloud forms a new star and planetary system it
A) expands, cools down, and spins slower B) contracts, heats up, and spins faster C) expands, cools down, and spins faster D) contracts, heats up, and spins slower