Funny comic that actually shows the problem with philosophy

This is a funny comic, and I’m gonna destroy it by analyzing it way too much. But I actually mean it, that this comic shows the whole idea behind philosophy. Getting an existential crises over the meaning of words. A dictionary problem.

These snakes get an existential crisis over the fact if they have necks or tails. First of all, what they actually have doesn’t in any way change the way they will live their life. Still, they get this crisis and I gotta say, I actually sympathize with them. What do they have in Gods name?!

But this is just a matter of how we define the words neck or tail. In a way the solution of this crises is artificial and insignificant, because it is just a matter of agreeing on a definition of these words. And I think this captures the whole philosophy, it is just about agreeing on words. But since all ratio and science is build on philosophy, this gives me an existential crises about how all of that is build on this quicksand. There is no rocksolid basis of science, even though it is so powerful in everyday life (medicine, engineering etcetera)

Excellent example of a fictitious force

In the reference frame of the astronauts there is suddenly a force pushing them to the side.

From the reference of space, or the earth (since space has no reference frame) there exists no force. It is just an accelerating rocket.

A force that vanishes from one reference frame is called a fictitious force.

Interesting quote regarding a problem with the equivalence principle.

​The relevant questions we consider are: Does a uniformly accelerated charge actually radiate? In a constant gravitational field should free-falling observers detect any radiation emitted by free-falling charges? Is the equivalence principle valid for such situations? If the answer to the first question is affirmative, a free-falling charge will radiate according to an observer at rest, because in a constant gravitational field, any particle should move with uniform acceleration. However, an observer falling freely with the charge would observe it at rest and no radiation at all. How can this answer be compatible with an affirmative answer to the first question? Moreover, if the equivalence principle is assumed to be valid, we would conclude that a charged particle at rest on a table should radiate, because for free-falling inertial observers the particle is accelerating. To explain this puzzle, we need to recognize that the concept of radiation has no absolute meaning, and that it depends both on the radiation field and the state of motion of the observer.

This dependence is the main conclusion of a celebrated and long debate, exhaustively presented in the recent series of papers by Eriksen and Grøn, where the reader can find relevant references.

Minkowski space and wave equation

Minkowski space-time is just regular flat space-time. There isn’t exactly anything ‘special’ about it, it’s just putting space and time together using the tensor framework. The only detail I wont to point out to you is look at the Laplacian in Minkowski space, or rather “Laplace’s” equation.

It is defined as

Since the signature of the metric is [-1 1 1 1] we end up with the equation:

Which is actually the wave equation in (3+1)D. The wave equation has one important difference from Laplace’s equation has a finite information propagation speed in the time axis, and if you give it initial conditions you actually see an expanding cone growing outwards in space of how far information from the initial condition has gone out. Laplace’s equation doesn’t have a distinguished axis in this sense.

The Repulsive force of Roundabouts.

 

 

What happens to the passengers if you go really fast around the roundabout?

 

 

Example 3: The car suddenly accelerates very quickly: you get pushed in your seat. Is the seat attracting you? Is the seat creating a force on your body?
Imagine going quickly around a roundabout in a car. You smash into the door. Does the door force have an attracting force on you? Or does a roundabout have a mysterious repelling force on the people in cars?

Ofcourse not, you are in a accelerating frame, so these  are not truly forces. They arise because of the acceleration of the car. The car curving + you sitting still=you moving towards the door. Your body wants to go in a straight line, but the car goes in a curve. So you fly into the door, or you get pressed into your seat. Ofcourse the seat and the door don’t have a magical force on you.

 

 

 

Zero energy universe

The zero-energy universe hypothesis states that the total amount of energy in the universe is exactly zero. The amount of positive energy in the form of matter is exactly canceled out by the negative energy in the form of gravity.

There are two forms of energy: Kinetic Energy and Potential Energy.

The potential energy of mass and the potential energy of gravity between that matter cancel out.If you want to calculate the potential of something, you have to state a reference for that potential.The reference location, where the potential is zero, is by convention infinitely far away from any mass, resulting in a negative potential at any finite distance.

All the matter in the universe has positive energy, or better said, is positive energy.All the matter in the universe produces gravity.Gravity has negative energy. What does it mean that gravity ‘has’ negative energy?

We have two objects – the earth, and a bowling ball far enough away from the earth that the potential energy of the gravitational field is very close to zero, and the kinetic energy of the bowling ball is zero (initially at rest). Wait. Given enough time, the bowling ball will eventually crash into the earth with significant POSITIVE kinetic energy (1/2mv^2 is always positive). Since energy must be conserved, and the total energy was very near zero initially, the total energy when the bowling ball hits the earth must also be very near zero. That means that we must have extracted NEGATIVE energy out of the gravitational field equal (but opposite sign) to the POSITIVE kinetic energy of the bowling ball when it hits the earth in order to conserve energy.

math is the compiler of the world.

math translates experiences in world language

 

language > math > universe (>: compiler)

 

Something is only objectively true if it is invariant.

The location of a rainbow is an illusion.

Statistics: Relationships between Probability distributions

https://en.wikipedia.org/wiki/Relationships_among_probability_distributions

 

 

 

 

 

Cooking: Vegetables

Tips:

1. Don’t overcrowd the pan
2. Keep cooking to a minimum
3. Least amount of water

Baking vegetables is better than cooking them. The best is baking with Extra Virgin Olive Oil.

For Italian base: Bell peppers, onions, garlic, prei, wortel (via markt/aldi kan het uit)

1 euro/dag via Itialiaanse roerbak 400 g.

0,33 euro/dag via diepvriesgroenten 600g.

For asian base: witte kool, prei, paprika, rode ui en rode peper

witte kool, sperziebonen, paprika, prei en taugé

Cheap: buy in frozen vegetables.

Cheapest vegetables (Market, frozen)

Cheapest meat (aldi, lidl, bonus)

Cheapest carbs (aldi, market)

Buy in large.

How to steam frozen vegetables in a microwave: 3 spoons of water in a glass bowl (Microwave proof) and put a plate on it. Then 2 minutes in the microwave, stir, and again two minutes in the microwave.

 

 

 

Comparing spacetime to a compass

That time and space are two sides of the same coin (spacetime). Time is orthogonal to space. This is what it means to be a dimension.

A windrose

Advantages the analogy to a compass:

1. Shows perpendicularity of the two
2. Shows analogies to phenomena related to curvature.
3. Is equal to dimension

Going through time like Sailing, with wind coming from the north.

There is one wrong point:

1. The metric of a compass is: d^2=N^2+E^2
2. The metric of spacetime is: d^2=S^2 – T^2

A ‘Spacetime’ windrose

What does it mean to travel ‘northeast’ with this compass? Try to answer this question on yourself.

 

 

The apparant ‘absoluteness’ of the windrose arises from the rotation of the earth. This creates an axis and the rotating iron core of the earth creates a magnetic field.

Everyone has a ‘Spacetime’-compass and the ‘North’ is always pointing towards the future. However, there not everyones compass agrees on each other.

 

‘Spacetime’-windrose including lightcones.