The moons of Mars, Phobos (Fear) and Deimos (Terror), are very close to the planet compared to Earth's Moon. Their orbital radii are 9,378 km and 23,459 km respectively. What is the ratio of the period of revolution of Phobos to that of Deimos?
A) 0.2528
B) 0.3998
C) 1.582
D) 2.858
E) 3.956
A
You might also like to view...
The helium flash shows up on the H-R diagram on the way to the horizontal branch
Indicate whether the statement is true or false
A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is __________
Fill in the blank(s) with correct word
Orbital electrons do not spiral into the atomic nucleus because of
1) electrical forces, 2) the wave nature of the electrons, 3) angular momentum, 4) the discreteness of energy levels, 5) quantum mechanical laws, and the electrons have discrete radii from the nucleus because 6) the circumference of each orbit is an integral multiple of the electron wavelength. 7) electrical forces act over discrete distances. 8) energy levels themselves are discrete.
Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship is
A) greater than the volume of fresh water. B) less than the volume of fresh water. C) the same as the volume of fresh water.