Way to remember nuclear fission and nuclear fusion for anyone who gives a fuck
Nuclear fission: If Quagmire entered the room,everyone in the room would run away. This would create a unstable amount of people bumping into each other. Just like with fission,when a neutron hits a unstable nuclei,causing it to spilt apart.
Nuclear fusion: If Edd Gould would to come back from the dead and put himself into a room,everyone would come towards Edd and hug him. This would create a huge group of people close together.Just like fusion,when a nucleus is fused together.
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Energy Stores ⚡🏪 - Physics
Magnetic energy store - the energy stored when poles attract or repel 🧲
E.g.: Fridge magnets, compasses, maglev trains which use magnetic levitation
Internal (thermal) energy store - the total kinetic and potential energy of the particles in an object aka the kinetic energy/vibrations of particles. Hotter object 🔥-> MORE internal energy (particles vibrate faster)
E.g.: Human bodies 🤾🏼, hot coffees ☕, stoves or hobs. Ice particles 🧊 too, just they vibrate slower.
Chemical energy store - the energy stored in chemical bonds, like the bonds between molecules
E.g.: Food, fuel, certain chemicals found in batteries
Kinetic energy store - the energy store of a moving object
E.g.: Any moving object, really
Electrostatic energy store - the energy stored when charges (protons+ & electrons-) attract/repel
Elastic potential energy store - the energy store of an object that is being squashed/stretched
Gravitational potential energy store - the energy of an object above the surface of the Earth 🌍 - the higher the object is, the higher its gravitational potential energy
E.g.: Planes ✈️, cups on tables 🍺, birds 🕊️, etc.
Nuclear energy store - the energy stored in the nucleus of an atom
E.g.: Uranium nuclear power, nuclear reactors
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Types of energy transfer ⚡🔀 - Physics
You can read more about energy stores in my previous post - Energy Stores ⚡🏪 - Physics! 😊
What is energy transfer?
When we talk about energy transfer, we talk about energy from one energy store being transferred to another
Energy can remain in the same store for millions of years or just a fraction of a second
There are energy transfers happening all the time - every time there is a change is a system (an object/group of objects), there is a change in the way energy is stored
Transferring energy
There are four types of energy transfer:
Mechanical work 🦾 - the energy transfer of a force moving an object through a distance
Electrical work ⚡- energy transferred by charges moving due to a potential difference
Heating 🔥 - thermal energy transferred from a hotter 🔥region to a cooler 🧊 region
Radiation - energy transferred via waves (e.g.: sound 🔊 waves, light 💡radiation, infrared (heat) radiation)
Example of energy transfer: A falling ball
You are holding a metal ball that doesn't bounce. You drop it...
While the ball is falling:
The gravitational potential energy of the ball decreases 📉 AS
The kinetic energy of the ball increases 📈
As the ball is falling, some energy is transferred to the thermal energy of the surroundings (air)
When the ball hits the ground:
The gravitational potential energy of the ball hits zero AND
The kinetic energy of the ball hits zero AS
Energy is transferred to the surroundings via sound waves (there's a noise when the ball hits the ground) and heat (thermal energy store of surroundings 📈)
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The Perseus Constellation
Post #17 in Physics and Astronomy, 03/02/2024
Welcome back,
In spirit of the Percy Jackson series’ first season coming to an end, I figured it was time to share some knowledge about a very famous constellation that you may or may not have heard of, named the Perseus constellation.
First, it may be appropriate to explain the story of Perseus, the mythical hero. I say this because a lot of the foundations of mathematics and metaphysics come from the work of Greek mathematicians and philosophers, so to explain some of his story is the least I can do to give it some justice.
Perseus, the Greek hero
The King Acrisius of Argos, disappointed in the fact that he didn’t have a son, consulted the Oracle at Delphi. He was warned that he’d be killed by his own grandson, and in fear of his own life, he imprisoned his only daughter, Danaë, in the courtyard of his palace. Despite this, she found herself with child eventually, as a result of Zeus himself falling in love with her. Deciding to visit her in the form of golden rain, she fell pregnant, eventually birthing a baby boy whom she named Perseus.
His most famous story, perhaps, may be the fact he was the one to slay Medusa. Polydectes, the ruler of the island of Seriphos, came to fall in love with Danaë. Perseus deemed him unfit for his mother, and, angry, Polydectes schemed to have Perseus sent away. In short, Perseus didn’t bring the correct gift to a large banquet held by Polydectes, so the former asked him to name any gift, and he’d bring it. The gift named was no other than the head of Medusa.
With the help of Zeus, Hermes, and Athena following a prayer to the gods (or the Hesperides in other versions), he was gifted with various items to help in his quest, like a pair of winged sandals, Hades’ helm of darkness, and Athena’s polished shield. With Athena’s guidance, Perseus was able to slay Medusa and take her head with him in a knapsack.
The final detail in Perseus’ story I find worthy of mention is his marriage.
Queen Cassiopeia of Aethiopia had once boasted that her daughter, Andromeda, was more beautiful than the Nereids (sea nymphs). This drew the vengeance of Poseidon, who set a upon the land a sea serpent.
Andromeda was tied to a rock on the shore, but Perseus was quick to come along and slay Cetus, the serpent, using the harp given to him by Hermes. Perseus and Andromeda were married soon after, and following her death, Athena hung her among the Perseus and Cassiopeia constellations in the sky.
How romantic.
Perseus’ location, surroundings, and features
Of all the constellations in the sky, Perseus is the 24th largest, occupying an area of approximately 615 square degrees. It’s within the first quadrant of the northern hemisphere, and its neighbouring constellations are Andromeda, as aforementioned, Aries, Cassiopeia, Taurus, and Triangulum.
There are also two meteor showers associated with Perseus, the Perseids (which should be visible in July-August of this year), and the September Perseids.
The International Astronomical Union approved of eight names for eight stars within the constellation. They are: Algol, Atik, Berehinya, Menkib, Miram, Mirfak, Misam, and Muspelheim.
Finding Perseus
Here’s the image from earlier again. Though you may only be seeing a cluster of stars at first, you’ll quickly realise there are some distinct shapes within this, shapes you’ll recognise across all images of the constellation. This image is a ground image found on the Hubble website.
Most notably within the constellation is the shape of a tilted stickman poised to strike, at least that’s how I’m seeing it.
You can find the full-size image here—it’s beautiful, I couldn’t show it here, since the file size is too large.
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