company that offers express delivery, shipping, and courier services, a series of large-sized packages, each with a mass of about 10 kg, are dispatched from a conveyor belt as shown below. The coefficient of static friction between the surface of the conveyor belt and each package is 0.8. Determine the angle θ, in degrees, where the packages first slip relative to the belt (loses contact with the conveyor belt). Assume that the package does not slip at any point, when it is still in contact with the conveyor belt

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A: Double D ring Below shows a Double D ring secured with a Nut and Bolt.

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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.