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11,307 results

1. Paper cut physics.

Author

Conover, Emily

Subjects
PAPER arts, STARS, RESEARCH personnel, CHICKENS, ASTRONOMERS
Abstract

This article from Science News explains the physics behind paper cuts. Researchers conducted experiments with a gelatin replica of human tissue and found that thin paper tends to buckle before it can cut, while thick paper typically indents the material but doesn't pierce it. The scientists identified a thickness of around 65 micrometers as the "sweet spot" for paper cuts. They also designed a 3-D printed tool called the Papermachete, which can act as a knife with low-cost replacement blades. Future research will focus on studying more realistic, finger-shaped materials. [Extracted from the article]

Published
2024

18. Folding n-pointed Stars and Snowflakes.

Author

Dutch, Steven I.

Abstract

Shows various methods of folding and cutting 4-, 5-, 6-, 7-, 9-, and 11-pointed stars. Discusses the geometry underlying each method. (MKR/SW)

Published
1994

22. Complete and commented translation of Guillaume's 1896 paper on the temperature of space

Author

André Koch Torres Assis and Marcos Cesar Danhoni Neves

Subjects
Physics, Stars, General Physics and Astronomy, Astronomy, Translation (geometry), Space (mathematics)
Abstract

Charles Edouard Guillaume (1861–1928) was a Swiss physicist who received the 1920 Nobel Prize in physics for his precision measurements and discovery of anomalies in nickel steel alloys. In this work, we present a complete and commented translation of his remarkable article of 1896 on the temperature of interstellar space. The importance of this work is that it is the oldest estimate known to us of the temperature acquired by a black body, which is in interstellar space far from other stars. This temperature was presumed to be due to an equilibrium state in which the radiation received by this body from the stars around it would be equal to the radiation emitted by the body. He arrived at a temperature of 5.6 K, regarding this figure as an upper limit on the effect he was seeking to estimate. In 1926, Arthur Eddington (1882–1944) arrived at a temperature of 3.18 K, utilizing essentially the same procedure but with better data.

Published
2020