Thermal Expansion: Two Identical Concrete Slabs Lie Flat and in Contact

question 7

Multiple Choice

Thermal expansion: Two identical concrete slabs lie flat and in contact with each other as shown in the figure. If the temperature increases by 40°C, the lower edges opposite the contact edges remained fixed in position, and the lower edges of the contact side remain in contact, at what angle will the slabs be tilted? The coefficient of thermal expansion of the concrete is 10 × 10^-6/K.

• A) 19°
• B) 0.028°
• C) 15°
• D) 1.6°
• E) The answer depends on the length of the slabs.

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Definitions:

Thylakoid Membrane

The thylakoid membrane is a component of chloroplasts that houses the machinery for the light reactions of photosynthesis, including the chlorophyll pigments.

Endosymbiotic Theory

Explanation of the evolution of eukaryotic organelles by phagocytosis of prokaryotes.

Eukaryotic Cells

Cells with a true nucleus enclosed in a membrane, along with other membrane-bound organelles, characterizing plants, animals, fungi, and protists.

Prokaryotic Cells

Cells without a defined nucleus or other membrane-bound organelles, commonly found in bacteria and archaea.