________ major contribution to astronomy is his extensive series of measurements of planetary positions.
A. Kepler's
B. Copernicus's
C. Galileo's
D. Tycho Brahe's
Answer: D
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According to Kepler's third law, the square of the planet's period in years is
A) equal to its perihelion distance from the Sun in AU. B) inversely proportional to its mass in kilograms. C) equal to the fourth power of its average temperature in degrees Kelvin. D) proportional to the cube of its semimajor axis in AU. E) equal to the square of its aphelion distance in AU.
An important use of x-ray diffraction was:
a. the observation of Compton scattering. b. determining the structure of the DNA molecule. c. production of positrons. d. observation of the photoelectric effect.
A 2.0-mol ideal gas system is maintained at a constant volume of 4.0 L. If 100 J of heat is added, what is the work done on the system?
a. zero b. 5 J c. ?3.3 J d. 20 J e. 3.3 J
Vision Problems: Nearsightedness is usually corrected with
A. converging lenses. B. diverging lenses. C. convex mirrors. D. cylindrical lenses. E. concave mirrors.