#QVB

[diversifiedvariety]

[exploringsydney]

George Street, Sydney | 22.6.24 | Panasonic LUMIX DC-FZ80

[karaage-chicken]

dates with ur friends 💕>>>

[lilredbird101]

Fuuuuck now I have the perfect date idea...

Imagine you've been to Sydney for the weekend with her...

Get settled at our accommodation then Taronga Zoo for the animals. She can pick the animal encounter at the end.

Start off the evening classy before we get destroyed; High afternoon tea at the QVB. I want to buy her something pretty from the jewelry stores there.

See something at the Event Cinemas, gold class.

Japanese for dinner. Baby can get whatever she wants.

Pre-drinks at the Three Monkeys and a few other local stars.

We get absolutely smashed at Newtown (lesbian hub) and dance our asses off, and make it to Oxford Street (gay/LGBT+ hub) at some point.

Get the really nice Thai food from the CBD as we walk home. They open late and it's great hangover food.

I would have tried to book us into the Hyde Park Inn, but it's shut down now :(

Hungover, we have a lay-in, get gozleme for breakfast via UberEats and devour it on the balcony with a few cigarettes and juice for me, then cuddle up with a blanket for the view or lay in a bit. Not too much though. Shit to do.

From there, it's time to hit the museums! Australia Museum and the Art Gallery of NSW and the Museum of Contemporary Arts would probably be the go. I'd love her to see the Archibald Exhibit if it's there. I have a feeling Sevika would have liked to draw or do some sort of art if she had the opportunity when she was younger.

Lunch at The Rocks. As we walk, I'd point out the cement used for the original sandstone houses from the invasion. The outcrop Sydney Opera House is on used to be five times the height before it was cut down for bricks. The Aboriginal middens which had great cultural significance were thought to be a rubbish dump, and so were ground up to use as lime for the concrete.

As we walk around the harbor, we drop a gummy each and go to the aquarium to stare at jellyfish and all the other critters. I know a guy who works out back, so he can get us above the tanks in a dingy to feed the sharks (honestly). There is a pair there who always lay with their fins atop each other. When one had to go in for medical treatment, the other became depressed and didn't eat until the other came back.

Cocktails at the Opera Bar, dinner, then a performance at the Sydney Opera House. Afters at a cocktail bar on our way home.

aquarium date with sevikacita

[austechandnature]

Queen Victoria outside QVB Sydney

[catepix]

[cheesenguinness]

QVB, Sydney. There is a charm to this old shopping place.

[rubydolly]

HAPPY HAPPY BIRTHDAY TO MY WONDERFUL FRIEND Izzy I’m so blessed to have a friend like you and love every minute that we spend together

[sophism]

was feeling the weight of the world so I thought I’d go outside for some fresh air and now I’m stuck in between a free Palestine protest and a Liam Payne memorial

[exploringsydney]

Window Reflections | York Street, Sydney | Panasonic LUMIX DC-FZ80

[noramoon]

oh yea did i tell yall abt the one time i was in the same building as rose from blackpink

[ryttu3k]

Last up from the Adelaide trip, the haul! Five books - Nature In Design and Great Musical Composers (for Mum!) I got at the goddamn incredible New Morning Books, which felt like the platonic ideal of second-hand bookstores. Lord of the Rings readers companion from Orchard Books, small but delightfully curated, in the gorgeous Adelaide Arcade. And Cakeboi Goes Vegan and Compound Fracture are new buys from a chain.

Two teas and smokey salt, from Gewurzhaus at the Adelaide Central Market. Fantastic stuff there. There's a store in the QVB, so when I'm next in the city and don't have to worry about airline weight limits, may well get some more! The crochet owl was available for sale at Curiositeas; the Keith Haring pin I got at the Art Gallery of South Australia. And finally, stickers! The stickers were from a funky stall at the craft markets on Rundle as part of the fringe, and are by @mel-eficent (also here, can't seem to find an online store?) and Burrows Arts!

Good stuff :D

[oliviax727]

Physics Friday: Electricity and Magnetism - why are they together?

Introduction - WTF is this?

So this is the first post which is pretty different to what I've done before on Tumblr, Reddit, etc. But given the fact that I have a bunch of knowledge on the subjects of physics, astronomy, mathematics, and computer science, I might as well ramble about it somewhere ... and what's a better place then a blog format on Tumblr!

So my idea is basically to do a weekly thing where I wax lyrically about some random topic within the realm of STEM, and let the internet people see it ... or not. I'm more interested in just getting the neat and cool ideas out there. So if you're seeing this and you're interested - neat! If you're not ... well I'm still going to do what I normally do and shitpost.

The topics will also vary in education level from primary all the way to university level. I'll try and highlight that in each post!

Some pre-info

Education level: High School (Y11/12) Topic: Electromagnetism (Physics)

Ok it's Physics time

At some point in your long life, maybe in class, maybe perusing the internet, you might've come across the term 'Electromagnetism' and gotten confused. Not because it's a complex word and it's 3 am but more that it's strange to see such an emphasis on a combination of Electricity (circuits, lightning, etc.) and Magnetism (Bar Magnets, etc.) and well, why is that? Why don't we focus on something like gravity and electricity or some other physical phenomenon? This is a question I often came across in high school. I saw all of the equations that related electricity and magnetism with eachother: Ampere's law, Faraday's law, the motor effect, Electromagnetic waves. But what intrinsically ties these two phenomenon together? After all, we know magnetism comes from electrons, and electricity comes. But still - this doesn't seem to complete the gap.

This was a question that a lot of people were concerned with, until Maxwell, Lorentz, and Einstein came along and changed our understanding of electricity, magnetism, and motion.

To figure this out, we won't actually need special relativity, because we can just imagine scenarios in a low-speed limit. But we still require relativity of a more classical variety.

So how does it work?

Consider a wire with a current running through the wire. Electrons are moving through the wire, causing the flow of current.

Now, because of Ampere's law, we know the wire produces a circular magnetic field around it.

Given what we currently know, the act of having a current - an electricity thing, producing a magnetic field, is really odd. But what if we were to introduce some velocity into the equation?

Say we now place an electric charge next to the wire, and it's stationary. Ignoring gravity for a moment, nothing happens. Why? Well because of the lorentz force F = qE + qvB there's nothing to move it. But now let's move this charged object at some speed along the wire, and let's say it's moving at exactly the same speed as the electrons in the wire. Now we have force! The charge begins to move perpendicular to the field and the charge starts flying towards the wire.

But this is a kinda boring explanation from the perspective of someone standing still, looking at the wire and seeing this happen. What if we were to look at things from the perspective of the charged object?

Well, given the rules of relativity, in the charge's perspective, the electrons are actually stationary, so from here - there IS no magnetic field!

So what happens now? Well because we have a straight line of electrons, and these electrons are still, we now have radially pointing electric field emanating from the wire. Because of this electric field - the charge will begin to move towards the wire, coincidentally at the same rate as what we see the observer.

Now look at what we have here. From the perspective of the stationary wire, a magnetic field is produced. From the perspective of the charge, we have an electric field.

The fact of the matter is that the electric and magnetic fields are the same thing - just from different perspectives. A pure magnetic field is just an electric field viewed from a different velocity, and what you may see as an electric field is just a magnetic field but because we're moving relative to it, it now affects us.

How Special Relativity Comes into this

We can represent this effect using another equation:

E' = γ (E+vB)

Where γ is the lorentz factor. This is where the lorentz invariance - special relativity comes into this. This is a direct solution of Maxwell's Equations.

Let's simplify this by removing the γ in a low-velocity limit, and also multiply both sides by an electric charge term q:

qE' = qE + qvB

E' is the electric field in a frame moving at a particular velocity, whereas E and B are the electric and magnetic fields in a different frame of reference.

Notice how both expressions represent the force applied to a charge. This is a representation of the relativistic interpretation of electric and magnetic fields.

Image Credit: Wikipedia

This image from Wikipedia, it shows the effect I've been talking about but visually. In the top section we have a man standing stationary to an electric charge, which emanates an electric field. From the perspective of the moving woman, the charge produces both a magnetic and electric field.

On the bottom we see the opposite. A stationary man sees a moving charge as having both an electric and magnetic field. But when we move at the same velocity as the charge, the magnetic field disappears and it appears entirely as an electric field.

Conclusion

In conclusion, why electricity and magnetism can be unified is because they are quite literally the same field, but from a different perspective.

Technically speaking, magnetic fields don't exist, they're just electric fields moving at a particular speed. We could also say the exact same about electric fields.

This revelation is what allowed Einstein to simplify Maxwell's equation into just one - using the power of tensors. Because really, the two forces are one in the same!

I very much hope you enjoyed reading this post. I'm going to be doing this every Friday. It's a bit rusty - and you probably had a hard time reading it. Feedback (both positive and negative) is appreciated!

[postsofbabel]

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[yoghurt-and-oatmeal]

tomorrow i am going to wake up naked with sun on my face and a comfy bed and a soft body and i will lift my wings and fly onto the QVB bird spikes to roost just to spite them because i will be a pigeon. Coo coo

[its-daisukenojobito]

Centrepoint Tower, QVB and The Galleries