Oil has a density ρ of 860kg/m3. an oil droplet is suspended between two plates 1.0cm apart by adjusting the potential difference between them to 1177v. when the voltage is removed, the droplet falls and quickly reaches constant speed. it is timed with a stopwatch and falls 3.00mm in 7.33s. the viscosity of air is 1.83×10−5kg/m⋅s. what is the droplet's charge q?

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?

2) why do satelites not fall while revolving around the earth?