Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete one orbit?
A. 320 days
B. 160 days
C. 20 days
D. 80 days
B. 160 days
You might also like to view...
All the following statements are true. Which one can be attributed to the exclusion principle?
A) Two electrons with the same spin cannot occupy the same energy level in an atom. B) If we know the location of an electron quite well, we will have little idea where it is going next. C) If an electron and antielectron meet, they will turn into energy through mutual annihilation. D) An electron has energy equal to its mass times the speed of light squared.
A wave's velocity is the product of the
A) frequency times the period of the wave. B) period times the energy of the wave. C) amplitude times the frequency of the wave. D) frequency times the wavelength of the wave. E) amplitude times the wavelength of the wave.
Because of refraction a fish in the water appears
A) nearer the surface. B) deeper in the water. C) at its actual depth.
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?
a. The greater mass hits the ground first. b. Both objects hit the ground at the same time. c. The smaller mass hits the ground first. d. No conclusion can be made with the information given.