The 151-lb exerciser is beginning to execute some slow, steady bicep curls. As the tension T = 23 Ib. is developed against an exercise machine (not shown), determine the normal reaction forces at the feet A and B. Friction is sufficient to prevent slipping, and the exerciser maintains the position shown with center of gravity at G. Note that there are 4 unknown reaction forces in this FBD. We only have 3 equilibrium equations that can be used to solve for these unknowns, so we cannot solve for all of the forces. The problem only asks us to find the normal forces NA and NB and we can solve for these two forces. We cannot find the friction forces FA and FB. Write one equilibrium equation T 25° C that can be used to find the force NA. Then solve for NA then NB

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Stair is a type of vertical transportation in a building which consist of a series of steps in a flight of stairs that enable the vertical movement of people and materials from one floor to another. A staircase consists of steps that comprises of riser & tread, handrail, baluster, stair stringers, newel post and waist slab. The construction of staircase with all the components is termed as stair construction. A staircase is an enclosure that contains the entire stairway. The materials used for the construction of stairs are bricks, reinforced cement concrete, stone, lumber, steel and a combination of these materials.