Precipitation, Runoff and Channel Flows on Titan

[julianscribner]

Homework Statement

Hey guys I am in dire need of some help and explanation here. I am taking a sedimentology class and there is some physics yet I have no background what so ever. If I could get some help that would be awesome ! I know there are some really intelligent people out there lets see what you got

Relevant Equations

To make our calculations simpler, we’ll assume τ*c = 0.045 which is common for rivers with gravelbeds. To calculate flow depth, we’ll still need to know the size (D) and density of sediment (ρs) that isbeing moved by the river, as well as the density of the flow itself (ρf). We already know slope (S) fromabove. Happily, we know the density of the sediment being moved because it is water ice (ρs = 900kg/m^3). Additionally, we know the density of liquid methane on Titan's surface to be ρf = 450 kg/m3. Also happily for us, the Huygens probe took a picture of rounded, river transported cobbles in one of the outflow channels (Figure 3). Measure the range of approximate grain diameter of 5 particles in the image, take the average of these and report your best guess at the average particle size in the table at the end of the questions.

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[haruspex]

Are you seeking help with the single question you wrote under "relevant equations" (which is for standard equations related to the field of physics; what you wrote there belongs under problem statement), or for all the questions in the PDF attachment?
Looks like most questions are followed immediately by their answers.

By the way, the question setter does not seem to understand the difference between mean (average) and median.