speed is cool and all but have you ever heard of
✨ acceleration ✨
Constantly
Yes. This is when you are really good at making your food last longer.
You’re thinking of refrigeration.
Acceleration is when matter in space starts to coalesce into stellar objects.
You’re thinking of accretion. I don’t know what acceleration means, though
It’s when you pop a minty gum in your mouth and chew it. You’ve accelerated your breath.
You’re thinking of exceleration. I don’t know what acceleration means, though
No that’s when you put everything in a spreadsheet. You’re thinking of inceleration.
Pretty sure it’s the process by which material is separated from the blood through the agency of the cells of the various glands and elaborated by the cells into new substances
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1.) 0.28 g 2.) 15.7 g 3.) 0.0034 g
I assumed 1m radius for the first and 5m for the second, particularly the second sounds off. Anyway… The centripetal force from Earth’s rotation is quiet negligible compared to its gravitation.
5 meters is definitely way too short for the chair swing ride. Look at the people in the seats. It’s definitely at least 10 meters.
Assuming 10 meters and 100 km/h, that gives about 7.9 g. That’s in the range of what fighter pilots might experience and well beyond where most people black out, so that’s still definitely too high.
Looking it up online, this is a pretty classic physics problem and the numbers you might see around it are closer to a radius of 12 meters and a speed of 13 to 17 m/s. Taking that as 15 m/s (54 km/h), that works out to about 1.9 g, which I can subjectively say feels much closer to the real value if you ever ride on one of these.
So, the second one is about 1.9 g
Yeah, those rides complete a rotation in ~10 seconds given what I was able to count in a couple YouTube videos, so 36°/sec. If they have a 10m radius, the linear velocity would be 6.283 m/s or 22.62km/he.
Considering most people will start to lose consciousness and risk heart issues at like 5g, I’m pretty sure the speed is way off on number 2.
That’s what the juice is for, inyalowda
The juice is inner conspiracy, sassa.
Killed Fred Fucking Johnson in his couch.
Thus neatly making the case that radius matters.
Girth, you say?
One is but a two pi greater version of the other.
Earth is merely spinning at 15 degrees per hour.
So one turn takes about… 24h?
Nobel prize coming your way
Oh my god.
Yes, that’s how the day and night cycle works
I feel like this is the most concise answer in this thread.
Omega squared baby!
acceleration is the answer
Yes, and a = v^2/r.
Merry-go-round: small radius, big acceleration!
Earth: big radius, small acceleration.
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Lol, guys it’s not acceleration it’s just the exact definition of acceleration. Which is definitely not acceleration.
None of those reference frames are accelerating.
The difference is whether there is a changing velocity or not.
I’m going to assume that you’re defining acceleration in that second statement, because I’m not sure if you are and “changing velocity” is literally what acceleration means. In any case, both acceleration and velocity are vectors, both have a direction, and so a person’s velocity sure as hell can’t be constant when they’re going in circles. Ergo, acceleration. I mean that’s what force is, mass times acceleration, so if you move and you can feel it you’re accelerating. Earth has gravity that can more than cancel it out, but we can’t say the same for rides.
Somebody smarter and with more energy than me can probably come up with a rough estimate of the g’s being pulled in each picture (ignoring gravity).
Edit: looks like someone did!
In any case, both acceleration and velocity are vectors, both have a direction, and so a person’s velocity sure as hell can’t be constant when they’re going in circles.
Well, you can if the space-time is curved right, that’s what orbits are, but that’t just a nitpick.
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We do understand the difference between speed and velocity. It’s just that acceleration is the change in velocity over time, not speed.
What? No, the radius just makes the speed “faster”, but what really matters is the frequency of rotation.
The merry-go-round is what, 20-25 RPM max? The carnival ride is only like 6-8 RPM. Both are a hell of a lot faster than 1RPD.
Are you American?
Yeah…why? Wanna fight about it? My army could take your army.
Explains a lot
This is like the lava and red goo thing
Speed and velocity are not the same thing.
In case you aren’t joking, I believe the relevant statement is that acceleration and “a change in velocity over time” are the same thing.
If you imagine driving a car forward in a straight line, pressing the gas will make you accelerate (velocity becomes more forward). Pressing the brake will also make you accelerate (velocity becomes less forward). Turning the steering wheel will also make you accelerate (velocity points more to the left/more to the right).
While I’m at it, you can do physics computations in a rotating frame of reference, but it produces some fictious forces, and gets really wacky quickly. An easy example is that anything far enough away from the axis of rotation is moving faster than the speed of light.
We know, but also neither are acceleration and the magnitude of acceleration the same. Acceleration is a vector - it has a direction just as velocity does. Here’s the definition I just copied from Google:
Acceleration: the rate of change of velocity per unit of time.
And here’s how you write that in math:
a=∆v/∆t.
If you want to know more about the relationships between position, velocity, and acceleration, take a calculus class. Isaac Newton literally invented it to solve problems like this
Rotation is acceleration towards the center with a velocity perpendicular to the centre. Using a frame of reference that rotates along with the object doesn’t change what is physically happening to that object, it just affects the way you observe what’s happening. A rotating frame of reference is itself accelerating and each of those frames of reference are accelerating.
We don’t feel the Earth’s rotation because gravity is accelerating our entire body and surroundings at the same rate, plus it’s not just the spinning keeping us in equilibrium; the left over force holds us on the ground.
The other two feel different because it’s the structures that provide the acceleration towards the centre, which then pushes on our bodies where it makes contact, and then the structure of our bodies pulls the rest and you can feel the forces of things wanting to move in the direction of inertia but being pulled around the circle instead.
If rotating frames of reference weren’t accelerating, turning a car would feel no different from going straight.
It’s almost like there’s no such thing as absolute velocity or something
Relativity
If you were only going 6 km/h you were doing it wrong
So what would happen if Earth suddenly stopped spinning? Would every building, tree and mountain suddenly fall Eastward?
I believe we’d have worse problems since the atmosphere would still be moving.
Yes, the Earth would be completely spherical in a matter of seconds.
Rather than speed we use radians/degrees per second. One of these things is very small.
short advantage
Circumference.
So true
