Question

What is the angle of repose?

a. the angle of bedding on hills where layers dip parallel to the slope
b. the angle of fractures on hills where fractures dip parallel to the slope
c.the angle at which rainfall strikes an unstable slope
d. the steepest angle at which loose material remains stable

Answer 1

The angle of repose is the steepest angle at which loose material, like soil or sediment, remains stable and does not move down-slope, with values varying by material type.

Step-by-step explanation:

The angle of repose is defined as the steepest angle at which loose material remains stable without moving down-slope. This angle varies depending on the type of soil, sediment, or loose material, as well as environmental conditions such as moisture. For instance, sandstone has an angle of repose of about 30°, while shale has one higher than 40°. The concept of angle of repose is significant in various geological contexts, such as the formation of clinoforms and cross-bedding, as well as when considering the stability of an object resting on an inclined plane where friction must balance the downslope component of the object's weight to prevent slipping.

Answer 2

option (d)

Step-by-step explanation:

The minimum angle of inclination of the inclined plane from the horizontal such that the object placed on the inclined plane is just start sliding down.

The value of angle of repose is given by the

tan θ = μ

Where, θ be the angle between the horizontal plane and the inclined plane and μ be the coefficient of friction.

It is also called as the angle of sliding.