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.

---

Definitions:

Recession

A phase of short-term economic downturn characterized by decreased trading and industrial output, generally recognized by a drop in Gross Domestic Product across two consecutive quarters.

National Debt

The aggregate financial obligations incurred by a government of a country through borrowing.

Tax Revenue

The income gained by the government through taxation, which is then used to fund public services and governmental functions.

Budget

An estimate of income and expenditure for a set period of time.