A Lamp of Mass M Hangs from a Spring Scale

question 12

Multiple Choice

A lamp of mass m hangs from a spring scale that is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read while the elevator descends toward the ground floor at a constant speed?

• A)more than mg
• B)less than mg
• C)mg
• D)zero
• E)This cannot be answered without knowing how fast the elevator is descending.

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Definitions:

Psychosexual Stage

A concept in Freudian psychoanalysis that refers to the different stages of a child’s development, each characterized by a focus on pleasure from a specific body area.

Adolescents

Young people in the transitional stage of physical and psychological development that generally occurs during the period from puberty to legal adulthood.

Defense Mechanism

Psychological strategies unconsciously used to protect oneself from anxiety arising from unacceptable thoughts or feelings.

Displacement

In psychology, it's a defense mechanism where an individual shifts negative emotions or impulses from the original source to a less threatening person or object.