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:

Clarifying Additive

A substance added to liquids to remove or to reduce the appearance of cloudiness or turbidity.

Polypropylene

A thermoplastic polymer used in a wide variety of applications, known for its toughness, flexibility, and resistance to various chemical solvents, acids, and bases.

Millad NX8000

A highly efficient clarifier used in the production of transparent polypropylene plastics, enhancing clarity and physical properties.

Acetonide

An acetonide is a ketal formed from the diol (a molecule with two hydroxyl groups) and acetone, often used as a protective group in organic synthesis.