"As celestial bodies are always moving, no one has ever been in the same place twice" Is this true or false?
True. Celestial bodies, such as planets, stars, and galaxies, are constantly moving and in motion. Therefore, no person has ever been in the exact same place twice due to the continuous motion of these celestial objects.
This statement is generally true. Celestial bodies, such as stars, planets, and moons, are continuously moving in space. The Earth, for example, rotates on its axis, orbits around the Sun, and also moves with the entire solar system through the Milky Way galaxy. As a result, the positions of celestial bodies are constantly changing. Therefore, it is highly unlikely that any individual can be in the exact same place twice due to the ever-changing positions of celestial bodies.
This statement is typically considered true. Celestial bodies, such as planets, stars, and moons, are constantly in motion through space. They rotate on their axes, revolve around other celestial bodies, and move within their respective galaxies. Due to this perpetual movement, it is unlikely for someone to be in the exact same physical location twice in the context of celestial bodies.
How much damage to the economy would be caused if everyone living in the USA withdrawed all their money from their bank accounts at the same time?
A complete withdrawal of all money from bank accounts in the USA by everyone simultaneously would have a catastrophic impact on the economy. This scenario is commonly referred to as a "bank run" or a "mass withdrawal."
Banks do not hold all depositor funds in cash; they rely on the fractional reserve system, where only a portion of deposits is kept in reserve. Banks use the rest of the money to provide loans, invest, and earn profits. If everyone were to withdraw all their money at once, banks would not have enough cash to meet the demand, leading to a liquidity crisis.
Consequences of such a scenario could include:
1. Bank failures: Many banks would be unable to provide cash to all depositors, resulting in widespread bank failures.
2. Economic collapse: The banking system is a critical part of the financial infrastructure. A complete collapse of the banking sector would lead to a severe economic downturn.
3. Loss of confidence: The faith in the banking system and the stability of the economy would be significantly undermined, causing panic and anxiety among the public.
4. Disruption of businesses: Businesses rely on bank financing, credit lines, and transactions for their operations. With a complete withdrawal of funds, businesses would struggle to operate, leading to layoffs, closures, and a decrease in economic activity.
5. Government intervention: To prevent a complete economic collapse, the government would likely step in and take emergency measures such as implementing capital controls, freezing assets, or enacting legislation to mitigate the crisis.
It's important to note that the likelihood of such an event happening is extremely low as it goes against rational economic behavior. Nevertheless, even a rumor or a partial bank run can have dire consequences.
"That's wrong. The earth is on an elyptical orbit, meaning that it indeed speeds up and slows down during the course of a year. The reason you cannot feel it is just that the change is incredibly slow.
The Math (not from me, took it from a comment of u/TheBlueWizardo):
"Speed of Earth at perihelion, when it's the fastest, is 30.29 km/s
Speed of Earth at aphelion, when it moves the slowest, is 29.29 km/s
It takes half a year to move between the two (that is 15768000 seconds)
the formula for acceleration is simple
a = [v(1) - v(0)] / t
So we just plug in the numbers aaand:
a = (30.29 - 29.29) / 15768000 = 0.00000006 km/s^2
That is the same acceleration as a car stopping from 50km/h (31mph) over the course of 64 hours." Is this true or false?
The information provided about Earth's elliptical orbit and the change in its speed throughout the year is true. The Earth does indeed follow an elliptical path around the Sun, and its orbital velocity is faster when it is closer to the Sun (perihelion) and slower when it is farther away (aphelion).
The calculation using the acceleration formula and the numbers provided seems to be correct as well. It shows that the acceleration resulting from the change in Earth's speed over half a year is approximately 0.00000006 km/s^2. This is equivalent to the deceleration of a car stopping from 50 km/h (31 mph) over the course of 64 hours.
Therefore, the statement is true. The change in Earth's speed due to its elliptical orbit is slow and not perceptible in daily life.
"everyone is commenting that because we are in an inertial space, we can't feel the force/change of speed. but I wanted to take on what the man really said in the video.
it is true that the earth changes speed but you can't compare it to hitting the breaks on your car not only because of the inertial reference frame but also because of the time during which you are decelerating:
the earth does change speed over one rotation, it takes half a year for the earth to go from apohelio to perihelion. at apohelio, the (center of the) earth is 152.098*10^9 m away from the sun, at perihelion, that distance is 147.098*10^9 m.
we can use this formula to get the speed of the earth :
sqrt (mu * (2/r - 1/a))
where mu is a constant depending on the sun (mu = 1.327*10^20 m^3/s^2)
a is the means of the earth's orbit radius (a = 1.496*10^11m)
and r the distance between the earth and the sun.
now at apohelio, the speed is 30.285 km/s
at perihelion, this speed is reduced to 29.289 km/s
this is great speed and 1Km/s is huge but this slow down takes place during half a year.
on average, each day the earth slows down by 5.45m/s each second, the speed of the earth should change on average by 6.3*10^-5 m/s or or 19 *10^-5 km/s.
you can't feel if your car is slowing by 10^-4 km/s.
to be noted. the earth's acceleration is not constant but I'm too lazy to do proper science. I just wanted to do some quick one because the comments weren't satisfying.
TL:DR : one year is more than enough to not fell the change of speed" Is this true or false?
The explanation provided in the comment seems to be accurate and reinforces the notion that the change in the Earth's speed due to its elliptical orbit is not perceptible in daily life. The calculations and comparisons made in the comment suggest that while the change in speed of the Earth is significant in terms of velocity, it occurs gradually over an extended period of time.
The comment states that on average, each day the Earth slows down by 5.45 m/s, or in terms of speed, by 19 * 10^-5 km/s. The argument made is that such a small change in speed, occurring over the course of a year, is not noticeable to humans. Comparing it to the sensation of a car decelerating at a similar rate further emphasizes this point.
Therefore, the statement is true. The Earth's change in speed over its orbit is minimal on a daily scale, and the gradual nature of the change makes it imperceptible to our senses.