Two 4. ? resistors are connected in parallel, and this combination is connected in series with 3 ?. What is the effective resistance of this combination?
A) 11. ?
B) 5. ?
C) 7. ?
D) 1.2 ?
E) 4. ?
B
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The _____________ is 18 years and 11 1/3 days long
a. sidereal period b. synodic period c. eclipse season d. saros cycle e. eclipse year
What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz. b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. c. Quasars showed significant gravitational lens effects. d. The spectra of quasars looked like that of an M dwarf. e. The large red shifts originally indicated that they were orbiting the center of the Milky Way.
Which of the following is NOT a solution to the Fermi Paradox?
A) no one is interested or able to communicate B) we are unable to detect their communications C) we are not interested in communicating D) no one is out there
All the planets orbit the Sun in exactly the same plane as the Earth
Indicate whether the statement is true or false