Galileo's observations of the entire phase cycle of Venus proved that Ptolemy's epicycles could not be correct in keeping Venus between us and the Sun
Indicate whether the statement is true or false
TRUE
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Which of the following is a microsecond?
A) 109s B) 106s C) 1000 s D) 10-9s E) 10-6s
Studies of solar vibrations have revealed that
A) the Sun vibrates only on the surface. B) neutrinos from the solar core reach the solar surface easily. C) the Sun generates energy by nuclear fusion. D) they are caused by processes similar to those that create earthquakes. E) our mathematical models of the solar interior are fairly accurate.
A square coil of wire with 15 turns and an area of 0.40 m2 is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s
What is the magnitude of the average induced emf? A) 6.0 V B) 12 V C) 36 V D) 45 V E) 90 V
One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, the path difference P1 - P2 must be equal to
A) an odd number of half-wavelengths. B) a whole number of wavelengths. C) zero. D) a whole number of half-wavelengths.