A simply supported beam supports the loads shown. The ground reactions and shear-force diagram are provided. The cross-sectional dimensions of the structural tube shape are also shown. At 7 ft to the left of roller support C, determine the magnitude of the shear stress at point H, which is located d = 2.25 in. below the top surface of the tube shape. The moment of inertia about the z axis is 771.08 n.4. A Units: kips B 7 ft 3.0 kip/ft 25.0 kips 60.60 kips 39.60 -21.00 8 ft 5 ft 15.60 -9.40 C 7 ft 9 ft 36.40 kips 12.00 12.0 kips D 12.00 0.375 in. H 0.375 in. 12 in. 16 in

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Q: 5. The beam is subjected to the loading as in the figure below. Determine_the absolute maximum…

A: Calculate the support reactions at point A ∑FV=0RA=12×3×6=9 kN∑MA=0MA-12×3×6×13×3=0MA=9 kN-m

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.