Final answer:
b) I-beam. The term I-beam reflects the shape of certain beams viewed from either end. I-beams are steel beams with an I-shaped cross-section, providing strength and rigidity while minimizing weight. Used in construction and other structures.
Step-by-step explanation:
The term I-beam reflects the shape of certain beams viewed from either end. I-beams are steel beams with an I-shaped cross-section, which provides excellent strength and rigidity while minimizing the weight of the beam. The top and bottom flanges of the I-beam provide resistance against bending, while the web in the middle adds stability.
One example of the use of I-beams is in construction, where they are often used for columns, beams, and trusses. The shape of the I-beam allows it to efficiently distribute the load along the length of the beam, making it ideal for supporting heavy loads.
Other options listed in the question include:
- Cantilever: a beam that is supported at only one end and extends horizontally without any support on the other end.
- Box girder: a beam with a rectangular or square cross-section that is used for bridges and other structures.
- H-beam: a beam with an H-shaped cross-section, often used in construction.