January 20–21, 2019 — Total Lunar Eclipse
On January 20-21, 2019, the total lunar eclipse will be visible in North America (see an animation).
National Metric Day 2018 | When is National Metric Day 2018?
National Metric Day
is observed every year
on 10/10.
It has been observed annually
on October 10th since 1976.
on October 10th since 1976.
One more attempt to graph displacement vs time
Both graphs are done by Lenicha in Excel. Good job!
Just one observation. In the graph below, points are precisely placed on a parabola (trendline option of a second-degree polynomial). That suggests a question about the graph above, which presents quite scattered points. The only reasonable explanation is in the launching method; the launcher equipped with a rubber band might not be the best solution.
Both graphs present a good start-point for further discussion in class.
Young Maria Curie
Maria Curie is pictured as a student. "Sklodowska" is her maiden name.
Since Maria’s homeland, Poland, was occupied by the Russian Empire, she attended an underground educational institute called the Flying University (Polish: Uniwersytet Latający). Maria continued her education in Paris, France.
Since Maria’s homeland, Poland, was occupied by the Russian Empire, she attended an underground educational institute called the Flying University (Polish: Uniwersytet Latający). Maria continued her education in Paris, France.
The picture was taken in June 2018 at an exhibition presented in the lobby of Warsaw Public Library, the Central Library of the Masovian Voivodeship.
Nicolaus Copernicus Monument
Canon of Proportions
The sculpture refers to the Vitruvian Man, sometimes called the Canon of Proportions, a drawing by Leonardo da Vinci (c. 1490). The picture was taken at Leonardo da Vinci International Airport in Rome, Italy.
Celebrating National Park Week
Oshunremi and Alexandra with Thomas Alva Edison,
Thomas Edison Museum in West Orange, NJ
The equivalent resistance of resistors in parallel
Excellent measurements and calculations by Ethan, Natalia, and Roselie. Congrats!
Nearsightedness and how corrective lenses fix this problem
I, like many people, struggle with being nearsighted. It is very frustrating to be unable to see things without the help of corrective lenses. I have always wondered the science behind why my eyes don’t work properly, and exactly how corrective lenses fix this problem. To focus on distant objects, the eye flattens and has a shorter focal length. When a person is nearsighted, they lack the ability to do this, and a blurry image is formed in front of the retina. It is fixed by using a diverging lens, which will diverge light before it reaches the eye; this results in a clear image being formed on the retina. Life as we know would not be possible without this real-life application of Physics.
(Kaitlyn, Source)
What does an avocado seed has to do with physics?
Growing an avocado tree from seed goes viral on the Internet. Numerous videos that document the growing plant are to be found on YouTube. The base of the method is to place the seed supported by three/four toothpicks in water. And here is what a trained physicist's eye spots immediately: the MENISCUS.
There are two menisci (yes, this is the plural) visible in the pictures.
There are two menisci (yes, this is the plural) visible in the pictures.
- A concave meniscus occurs when the liquid is attracted to a surface of another object (adhesive forces). In the picture, it looks like the water claims the wooden toothpick.
- A convex meniscus occurs when the forces between liquid particles are stronger than between the particles and the surface (cohesive forces). Here demonstrated at the surface of an avocado seed.
A Quick Lesson in Ancient Greek
φύσις [physis] – “nature”
*
φυσική [physike] – “knowledge of nature”
Optical Bench. Focal Length of a Lens.
Graph by Hannah and Rex
Graph by Diana and Rosa Graph by Cristian and Leandro
What do the Pole Reversals, Magnetic Field, and an Egg Have in Common?
The video presents two eggs. One is boiled, one is raw. Can you recognize which one is boiled?
The first egg presented in the video is hard boiled. The yoke inside sits firmly in the white. Both parts get the same rotational momentum.
The second one is not boiled. The yoke inside has a momentum different than the white. The egg wobbles a bit but doesn't rotate like the first one does.
***
That phenomenon helps us to understand the theory of the Earth's magnetic field. We think that the field is generated as the result of a layer of liquid metal, surrounding the solid iron core. The layer of liquid metal rotates with a different momentum than the planet's surface. From the surface, the inner flow of liquid metal can be seen as an electric current inside the planet. That current generates the Earth's magnetic field. Isn't that cool? In addition, the theory is useful to explain the magnetic pole reversal.
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