A Horizontal, 10-M Plank Weighs 100 N

question 24

Multiple Choice

A horizontal, 10-m plank weighs 100 N.It rests on two supports that are placed 1.0 m from each end as shown in the figure.How close to one end can an 800-N person stand without causing the plank to tip?

• A)0 m
• B)0.3 m
• C)0.5 m
• D)0.7 m
• E)0.9 m

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Definitions:

REM Behavior Disorder

A disorder in which the muscle paralysis that normally occurs during REM sleep is absent or incomplete, and the sleeper is able to act out his or her dreams.

Dreaming

The experience of envisioned images, sounds, or other sensations during sleep, often narrative in nature and involving elements from waking life.

Muscles

Tissues in the body that have the ability to contract, enabling movement of different parts of the body.

Sigmund Freud

An Austrian neurologist known as the founding father of psychoanalysis, a method for treating psychopathology.