Tycho Brahe's contribution to Kepler's Laws of Planetary Motion were
A) his detailed and accurate observations of the planet's position.
B) his observations of Jupiter's moons.
C) a mathematical explanation of epicycles.
D) a precise lunar calendar.
E) the correct explanation of lunar phases.
A
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Two cables of the same length are made of the same material, except that one cable has twice the diameter of the other cable
When the same potential difference is maintained across both cables, which of the following statements are true? (There may be more than one correct choice.) A) The electrons have the same drift velocity in both cables. B) The same current flows through both cables. C) Both cables carry the same current density. D) The current in the thin cable is four times as great as the current in the thick cable. E) The current in the thin cable is twice as great as the current in the thick cable.
The ___________of the product is the extent to which the product meets the performance criteria.
Fill in the blank(s) with the appropriate word(s).
Single-Slit Diffraction: When light of wavelength 450 nm falls on a single slit of width 0.30 mm, what is the angular width of the central bright region?
A. 0.086° B. 0.13° C. 0.17° D. 0.26° E. 0.35°
A cubical gaussian surface is bisected by a large sheet of charge, parallel to its top and bottom faces. No other charges are nearby. Over how many of the cube’s faces is the electric field zero?
1.0 2.2 3.4 4.6