Naval Architecture And Marine PE

Critical for ship stability problems. Remember that displaced volume V is the submerged portion only, not total vessel volume. For floating bodies, buoyant force equals weight at equilibrium. Often combined with metacentric height calculations.

This is the flexure formula rearranged for bending moment. Remember that y is measured from the neutral axis to the point of maximum stress (usually the extreme fiber). For ship hulls, consider both hogging and sagging conditions. Maximum stress typically occurs at deck or keel.

Cavitation number appears frequently on naval architecture and hydraulic machinery problems. Remember: σ < 0.2 typically indicates high cavitation risk. Always check vapor pressure at operating temperature - it increases exponentially with temperature. Don't forget hydrostatic pressure contribution at depth.

Essential for all piping calculations. Know that friction factor depends on Reynolds number and relative roughness. For exam speed, memorize f ≈ 0.02 for turbulent flow in commercial steel pipe. Always check if pipe diameter is given as inside or outside diameter.

This is the fundamental DC power equation. For AC systems, remember that this gives apparent power only when voltage and current are RMS values. For real power in AC circuits, multiply by power factor (P = VI cos φ). Always check if the problem specifies AC or DC conditions.