Newton's version of Kepler's third law states: p2 = × a3 According to this, what observational information does one need in order to calculate the combined mass of a planet and its moon?
A) the orbital period and the density of the two objects
B) the average distance between the two objects and the orbital period
C) the radius of the two planets in meters and the average distance between them
D) It is impossible to determine the mass of any astronomical object.
B) the average distance between the two objects and the orbital period
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The main observable difference separating Type I and Type II supernovae is ____
a. neutrino emission b. iron absorption lines c. a difference in luminosity of several thousand times d. the presence or absence of hydrogen absorption lines e. the presence or absence of hydrogen emission lines
How far above the horizon is the moon when its image, reflected in a calm lake, is completely polarized? (nwater = 1.33.)
a. 22.2° b. 7.7° c. 16.6° d. 36.9° e. 53.1°
The position of an object is given as a function of time as x(t) = (3.00 m/s)t + (2.00 m/s2)t2. What is the displacement of the object between t = 4.00 s and t = 5.00 s?
A) 8.00 m B) 5.00 m C) 21.0 m D) 65.0 m E) 44.0 m
When you blow some air above a paper strip, the paper rises. This is because
A) the air above the paper moves faster and the pressure is higher. B) the air above the paper moves faster and the pressure is lower. C) the air above the paper moves faster and the pressure remains constant. D) the air above the paper moves slower and the pressure is higher. E) the air above the paper moves slower and the pressure is lower.