Under Which of the Following Conditions Can a Ladder Standing

question 17

Multiple Choice

Under which of the following conditions can a ladder standing on a frictionless horizontal floor and leaning against a rough vertical wall be in equilibrium?

• A)The normal force exerted by the floor on the ladder equals the normal force the wall exerts on the ladder.
• B)The weight of the ladder is equal in magnitude to the frictional force the wall exerts on the ladder.
• C)A ladder in this situation cannot be in equilibrium.
• D)The normal force exerted by the floor on the ladder equals the weight of the ladder.
• E)The normal force exerted by the floor on the ladder equals the frictional force the wall exerts on the ladder.

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Definitions:

Sound Vibrations

These are oscillations of pressure transmitted through mediums such as air or water, perceived by the auditory system.

Cochlea

A spiral-shaped, fluid-filled inner ear structure that plays a key role in the process of hearing by converting sound waves into nerve impulses.

Retina

The light-sensitive layer of tissue at the back of the inner eye that converts light images into neural signals sent to the brain.

Optic Disk

Area of the retina where the optic nerve exits the retina; lacks photoreceptors and so causes a blind spot.