What is the value of acceleration due to gravity in imperial units?

• A. 9.81 m/s^2
• B. 32.2 ft/s^2
• C. 14.7 psi
• D. 62.4 lb/ft^3

Answer: (B)

The value of acceleration due to gravity in imperial units, specifically in feet per second squared, is 32.2 ft/s². This value is derived from the fact that gravity pulls objects towards the Earth at a rate of approximately 32.2 feet per second for every second that an object is in free fall.

In contrast, the first option, 9.81 m/s², is the metric equivalent of gravitational acceleration, which is commonly cited in areas that use the metric system. Options related to pressure (14.7 psi) and density (62.4 lb/ft³) do not pertain to gravitational acceleration and are thus not applicable in this context.

Understanding that gravitational acceleration is a fundamental concept in physics and engineering helps in various applications, such as calculating loads, understanding motion, and designing structures to withstand forces due to weight. Recognizing the correct units, whether metric or imperial, is essential for accurate calculations in civil engineering practices.