2.8: Problem set

Rain or Shine: An Introduction to Soil Physical Properties and Processes (CRPSCI 036) · LibreTexts

0%

Contents

    Text

    Size
    100%
    Theme
    Typeface
    Line length
    Spacing

    From LibreTexts, under CC BY 4.0, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    1. Calculate the terminal velocity in water at 20°C for each of the following. Assume a particle density of 2650 kg m-3, a water density of 1.00 × 103 kg m-3, and a viscosity of 1.00 × 10-3 kg m-1 s-1.
      1. 100. µm diameter sand particle
      2. 10.0 µm diameter silt particle
      3. 1.00 µm diameter clay particle
    2. Determine the USDA textural class for the following soil samples:
    Sample # Sand (%) Silt (%) Clay (%) Textural class
    1 26 42 32  
    2 85 7 8  
    3 33 54 13  
    1. Go outside and use texture by feel to find soil from two different textural classes and report the latitude, longitude, and estimated textural class. If you are in the USA, use the SoilWeb app (iOS or Android) to determine and report the expected soil series for your location. Do not trespass. Use all appropriate safety precautions.
    2. The following 5.0 cm diameter soil samples that are 5.1 cm in length were dried at 105°C for 24 hours. Calculate the bulk density and porosity of each sample.
    Sample # Dry Mass (g) Bulk Density (g cm-3) Porosity (cm3 cm-3)
    1 108    
    2 105    
    3 132    

    This page titled 2.8: Problem set was last modified on Sun, 08 Jun 2025 00:15:01 GMT and is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Tyson Oschner.