Which of the following statements about forces is true? A) The distributed load can be represented as straight, triangular or trapezoidal. B) The intensity of an equivalent single charge is equal to the area under the given distributed load diagram. C) The point of action of the equivalent single load is the center of gravity of the distributed load diagram. D) The unit of the distributed load is shown as force divided by length. E) all

A wooden beam is loaded by a distributed load w = 7 N/mm as shown in Figure Q4(a). The cross- section of the beam is shown in Figure Q4(b). Assume that LAB = 1800 mm, LBC = 3200 mm, W=190 mm, B₁ = 30 mm, and H = 210 mm, h=20 mm. Units: use N, mm, MPa as consistent units for all calculations. Decimal points: any decimal points are fine and all the numerical questions have a 10% error tolerance. Steps: Fill the gaps in the "steps" to get some marks from the working-out process. Adaptive marking is still used. (a) (b) A 777777 W LAB = B LBC Bo Cross-section hot H X yx Figure Q4: (a) A wooden beam is loaded by a distributed load, (b) cross-section of the beam. Wo y √² Qa a) Determine the 2nd moment of area of this cross-section with respect to the z-axis in Figure Q4(b)? I mm4

A submarine robot explorer is used to explore the marine life in deep water. The weakest point in the submarine robot explorer structure can hold a pressure force of 300 MPa. What is the deepest point can it reach? *

2) A) Find how much of force FAB is in the direction of bar OA. b) Find how much of force FAB is perpendicular to the direction of bar OA. 4 ft 1 ft o F = 120 lb B