An Overhead Garage Door Has Two Springs, One on Each

question 117

Multiple Choice

An overhead garage door has two springs, one on each side of the door. A force of 16 pounds is required to stretch each spring 1 foot. Because of the pulley system, the springs stretch only one-half the distance the door travels. The door moves a total of 16 feet and springs are at their natural length when the door is open. Find the work done by pair of strings.

• A) 512 ft-lb
• B) 1,024 ft-lb
• C) 8,192 ft-lb
• D) 4,096 ft-lb
• E) 2,048 ft-lb

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Definitions:

Direct Investment

The ownership of overseas facilities.

Exporting

The sale of goods and services to foreign markets.