Questions: Exam 3 Item 11 Part A In unconsolidated materials, the angle of repose is . 25°-40° greater than 40° less than 25° 15°-25° 40°-75° Submit Request Answer

The answer is the first one: $25^{\circ}-40^{\circ}$.

Explanation for each option:

1. $25^{\circ}-40^{\circ}$: This is the typical range for the angle of repose in unconsolidated materials. The angle of repose is the steepest angle at which a pile of unconsolidated material remains stable, and for most granular materials, this angle falls within this range.

2. greater than $40^{\circ}$: This is generally too steep for most unconsolidated materials. While some materials might have an angle of repose slightly above 40 degrees, it is not common for the majority of unconsolidated materials.

3. less than $25^{\circ}$: This is generally too shallow for most unconsolidated materials. While some very fine or smooth materials might have a lower angle of repose, it is not typical for the majority of unconsolidated materials.

4. $15^{\circ}-25^{\circ}$: This range is too low for most unconsolidated materials. It might apply to very fine or smooth materials, but it is not representative of the typical range.

5. $40^{\circ}-75^{\circ}$: This range is too high for most unconsolidated materials. Such steep angles are usually not stable for unconsolidated materials and are more characteristic of consolidated or cohesive materials.

Summary: The angle of repose for unconsolidated materials typically falls within the range of $25^{\circ}-40^{\circ}$.