A Shopper Steps on an Escalator Moving Downward at a Constant

question 45

Multiple Choice

A shopper steps on an escalator moving downward at a constant speed toward the bargain basement in a large department store.On his way down,the normal force exerted on him by the step of the escalator is

• A)greater than his weight when he is off the escalator.
• B)equal to his weight when he is off the escalator.
• C)less than his weight when he is off the escalator.
• D)dependent on how fast the escalator is moving.
• E)unknown; insufficient information is given to answer correctly.

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Definitions:

Polymer

Large molecules composed of repeating structural units called monomers, which are bonded together via a process known as polymerization.

Cis-1,4-Polybutadiene

A type of synthetic rubber made from the polymerization of 1,3-butadiene monomers, where the polymer chains have a cis configuration leading to higher elasticity.

Synthetic Rubber

Man-made elastomers produced from petroleum byproducts through polymerization, designed to mimic the properties of natural rubber.

Dacron

A synthetic polyester fiber made from polyethylene terephthalate, known for its durability, resistance to stretching and shrinking, and chemical inertness.