Suppose it is late June. Based on the given right ascensions and declinations, which of the following stars crosses your meridian around midnight? Assume you live at a latitude where all the stars on this list rise above your horizon each day. (Hint: Recall that the Sun's celestial coordinates on the June solstice are RA = 6h, dec = +23-1/2°.)
A) Sirius: RA = 6hr 45m, dec = -16°42'
B) Canopus: RA = 6hr 24m, dec = -52°41'
C) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
D) Arcturus: RA = 14hr 16m, dec = +19°11'
E) Vega: RA = 18hr 37m, dec = +38°47'
E) Vega: RA = 18hr 37m, dec = +38°47'
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An electron is accelerated from rest through a potential difference of 50.0 kV. What is the TOTAL energy of the electron? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 9.00 × 10-14 J B) 8.20 × 10-14 J C) 16.2 × 10-15 J D) 8.00 × 10-15 J E) 16.2 × 10-14 J
The best places for life to have formed on Earth are believed to have been
a. near the south pole on the ice. b. on the continent of Africa in the areas with no water. c. in liquid water, probably in the oceans or pools of water.
Which statements about the magnetic fields of Uranus and Neptune is FALSE?
A) Neither fits the Dynamo model very well. B) Uranus' field is tilted 60 degrees off its already tilted rotational axis. C) Neptune's field is tilted 47 degrees to its more conventional rotational axis. D) Both pass directly through the cores of their planets, like all other fields. E) Both may have ammonia water replacing the liquid metallic hydrogen.
Plate tectonics is currently found
A) on all of the terrestrial planets B) only on Venus and the Earth C) only on the Earth, Venus and Mars D) only on the Earth