অন্যান্য - Read Mode
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Explanation
Coarse-grained soils (like gravel and sand) have lower specific surface areas and inter-particle friction compared to fine soils, allowing them to be compacted to higher densities with less water.
Explanation
A trickling filter uses biological action where sewage trickles over a media (stones/plastic). It acts as a biological reactor, but the trickling also implies a filtration-like process.
Explanation
For purely frictional soil (cohesionless, c=0), stability depends primarily on the slope angle relative to the angle of internal friction. If slope < friction angle, it is stable.
Explanation
Hoop stress (or circumferential stress) acts along the circumference of the cylinder. It is tensile and twice the magnitude of the longitudinal stress in thin shells.
Explanation
For a rectangular beam section, shear stress varies parabolically and is maximum at the neutral axis, where bending stress is zero. At the top and bottom edges, shear stress is zero.
Explanation
Fish plates are metal bars used in rail tracks to join two rails together end-to-end, maintaining continuity and alignment while allowing for thermal expansion.
Explanation
The coefficient of friction is a property of the materials in contact. It depends on the nature/roughness of the surfaces but is independent of the contact area (Amontons' Law).
Explanation
Formwork for vertical sides of columns, walls, and beams can be removed relatively quickly, typically after 24-48 hours (1-2 days), as they don't carry significant load.
Explanation
The moment of inertia of a triangle about its base is bh³/12. About its centroidal axis (parallel to base), it is bh³/36.
Explanation
Coefficient of passive earth pressure Kp = (1 + sin φ) / (1 - sin φ). For φ = 30°, Kp = (1+0.5)/(1-0.5) = 1.5/0.5 = 3.