One-way? Really?

Classical Mechanics Level 3

The picture shows a metal plate in the shape of a square with a circular hole cut in its middle. This plate is heated. What do you think will happen to the size (area) of the hole?

Decreases because the metal plate due to increase in vibrations of metal atoms in all directions. Remains the same because only metals expand while holes do not. Increases because the metal wants to feel spiritually connected to the universe (holy; hole-y ;)). Increases Decreases because the metal plate expands in all directions

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.