A Railroad Bridge Is Built Over a V-Shaped Canyon

question 99

Multiple Choice

A railroad bridge is built over a V-shaped canyon. If the supports are 8 feet long at each end, the center support is 560 feet long, and the supports increase in length by 4 feet with each support (from 8 feet to 560 feet) ,
What is the total length of all the supports?

• A) 78,384 ft
• B) 78,392 ft
• C) 78,396 ft
• D) 78,388 ft

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Definitions:

East Pacific Rise

A Mid-Oceanic Ridge in the eastern Pacific Ocean associated with a divergent tectonic plate boundary where new oceanic crust is formed through volcanic activity.

Accretionary Prism

A prism-shaped pile of rock and sediment detached from the upper part of a descending tectonic plate and adhered to the plate above it at a collision zone between tectonic plates.

Subduction Zone

The region where one tectonic plate moves under another, leading to volcanic activity and earthquakes.

Magma

The molten or semi-molten natural material from which all igneous rocks are derived, existing beneath the Earth's surface.