Explain how Copernicus would account for the retrograde loops of superior planets
What will be an ideal response?
The Earth moves faster than these outer worlds, so at opposition we overtake them and as we sweep past them, they appear to retreat westward for a few weeks.
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A _____ is composed of ionized gas trapped in a magnetic arch rising up through the photosphere and the chromosphere into the lower corona
A) chroma B) constellation C) nebula D) prominence
Applications to Astronomy: What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly? The earth's orbit has a mean radius of 1.5 × 108 km, and 1 ly = 9.46 × 1015 m.
A. 1.2 × 10-14 degrees B. 2.1 × 10-4 degrees C. 1.2 × 10-7 degrees D. 2.1 × 10-7 degrees
Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
A. 40 hrs B. 25 hrs C. 50 hrs D. 65 hrs E. 50000 hrs
Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2
What is the magnitude of the charge on each bead? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 510 nC B) 44 nC C) 1800 nC D) 890 nC E) 1300 nC