Kepler's first law worked, where Copernicus' original heliocentric model failed, because Kepler described the orbits as:
A) elliptical, not circular.
B) much larger than Copernicus had envisioned.
C) around the Sun, not the Earth.
D) being on equants instead of epicycles.
E) complex, with epicycles to account for retrograde motions.
A
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Humans
A) and primates evolved from a common ancestor B) and primates evolved directly from dinosaurs C) and primates evolved directly from birds D) evolved directly from modern primates
Which of the following is not conserved?
a. lepton number b. baryon number c. meson number d. energy
Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination?
A) The equivalent resistance is equal to that of any one of the resistors. B) The equivalent resistance is equal to average of the four resistances. C) The equivalent resistance is less than that of the smallest resistor. D) The equivalent resistance is less than that of the largest resistor. E) The equivalent resistance is more than the largest resistance.
If the movable mirror in a Michelson interferometer is moved 120 microns, how many fringes would be counted for 600 nm light?
A) 200 B) 720 C) 100 D) 300 E) 400