Q: What is the minimum length ladder that a worker needs to access a landing nine feet above the adjacent floor?

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A straight ladder should extend at least 3 feet above the work surface or landing for safe access to and from the ladder. This helps provide stability and a secure handhold when climbing up or down.

From the US OSHA Construction standards:1926.1053(b)(1)When portable ladders are used for access to an upper landing surface, the ladder side rails shall extend at least 3 feet (.9 m) above the upper landing surface to which the ladder is used to gain access; or, when such an extension is not possible because of the ladder's length, then the ladder shall be secured at its top to a rigid support that will not deflect, and a grasping device, such as a grabrail, shall be provided to assist employees in mounting and dismounting the ladder. In no case shall the extension be such that ladder deflection under a load would, by itself, cause the ladder to slip off its support.

Approx. 21". If there is space for it, consider the size of a drop down ladder unit, which is more useful than an opening that requires a ladder.

Providing that the ground is level and that the wall is straight, you have the outline of a right angled triangle with an adjacent angle of 73 degrees and an adjacent length of 1.17 metres. In order to find the length of the hypotenuse (which is the ladder itself) we use the cosine ratio: cosine = adjacent/hypotenuse Which when rearranged is: hypotenuse = adjacent/cosine hypotenuse = 1.17/cosine73 degrees = 4.001755235 So the length of the ladder is 4 metres correct to one significant figure.

An accommodation ladder is a flight of stairs or a ladder for lowering over the side of a ship for access to and from a small boat.

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You should normally have three rungs(steps) past the surface you are climbing to from the ladder. They are a foot apart on most ladders so 15 feet would be close. Add a foot since you have to angle the ladder appropriately(scope) so 16 feet or longer is safe. A 20 foot extension ladder would be a good choice.

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If the cage extendes for more than a specified distance without a landing, then you will need to use fall protection when climbing a caged ladder.

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In the DS game "The Golden Compass," you can access the roof by locating and using the ladder located in the courtyard of Bolvangar. Look for a ladder icon on the touchscreen to interact with it and climb to the roof.

A ladder is typically considered as a piece of equipment rather than a tool, as it is used for access and support rather than manipulation or work.