Asatellite of mars, called phobos, has an orbital radius of 9.4 106 m and a period of 2.8 104 s. assuming the orbit is circular, determine the mass of mars.

The radius and time period of orbit of a sattellite are related by the formula:
R³ = GMT²/4π²; where R is the orbital radius, T is the orbital time period, M is the mass of the more massive body, G is the graviational constant
(9.4 x 10⁶)³ = (6.674 × 10⁻¹¹)(M)(2.8 x 10⁴)² / (4π²)
M = 6.27 x 10²³ kg

Because there is no air in the jar, the vibrations can not travel through the air and create sound.  (that's why there is no sound in space, there is no air)