Boltzmann's constant, kB, may be derived as a function of R, the universal gas constant, and NA, Avogadro's number. Which expresses the value of kB?
a. NAR2
c. R/NA
b. NAR
d. NA/R
C
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Kepler's laws of planetary motion were _____ because he could not provide an explanation for his conclusions
a. unnatural b. empirical c. hypothetical d. principles e. assumptions
An electron in a cathode ray tube is accelerated through a potential difference of 10 kV. What kinetic energy does the electron gain in the process? (e = 1.6 × 10^-19 C)
a. 8.0 × 10^-16 J c. 8.0 × 10^22 J b. 1.6 × 10^-15 J d. 1.6 × 10^-16 J
A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2
(a) How long after beginning to accelerate does it take the car to move 3.50 km? (b) How fast is the car moving just as it has traveled 3.50 km? What will be an ideal response?
Where was the Sun in Ptolemy's model of the universe?
A) at the center B) slightly offset from the center C) between Earth and the Moon's orbit D) between the orbits of Venus and Mars E) at the outer edge, beyond Saturn's orbit