Problem 1. Squawking cup

Statement

A long thread is attached to the bottom of a plastic cup. Wrap tightly a piece of wet paper towel around the thread and pull it down. Investigate and explain the squawking sound created in this experiment.

Statistics

Number of reports: 4

Number of rejections: 0

Average Reporter Grade: 17.4

Average Opponent Grade: 13.0

Average Reviewer Grade: 7.1