Problem 1. The coefficient of static friction between Box A with a mass of 220 kg and the inclined surface is 0.10. A rope, tied to the box, passes over a cylinder and the coefficient of static friction between the rope and the fixed cylinder is 0.05. If a woman pulls on the free end of the rope, the force the woman must exert on the rope to cause the box to start moving up the inclined surface is *

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Stair construction and layout

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.