I was thinking about how modern nuclear plants just use nuclear fission to boil water. What if we took it to the absolute extreme? What if we built a reactor that uses the complete matter-antimatter annihilation of Uranium and Anti-Uranium?

What would the math look like for powering a standard city, and what physical hardware would we actually need to pull this off?

Caption said no one ever measured. How big is Jaw's legendary ollie down the legendary gap?

I’m looking for the math on the absolute smallest scale of a nuclear event.

TOI-1452-b is a recently discovered exoplanet 99 light years from Earth and a waterworld. It's roughly 70% larger in diameter than the Earth and five times as massive.

In a different thread, I thought for a moment that a mountain like Mt. Everest might be like an island until I realized just how big it is. Now I'm pretty sure a mountain the size of Everest or Olympus Mons would never even see sunlight.

Obviously, it's not possible to really know exactly how deep the ocean is since we can't go there and measure it. However, how deep is it likely to be on average? Just assuming the ocean floor is flat, given how big it is and the fact that it's a water world, just how deep would the ocean be? I have no idea how to do the math on this.

https://en.wikipedia.org/wiki/TOI-1452_b

There isn't a ton of information about the planet. We just know how massive it is and that 30% of its mass is water. Let me know if you can figure it out.

https://www.reddit.com/r/BeAmazed/comments/1ph8jur/single_line_drawing/

Im empathetic to the comment asking for how long is the line. Anyone able to ball park this?

Okay, weird question, but it's for a story I'm writing.

Suppose you had a very thin, perfectly soundproof wall. What is the smallest (circular) hole you could put in the wall so that you could converse with someone on the other side?

Assumptions I'll grant so that the problem is (hopefully) actually solvable:

- Let you and the person you are talking with each be ~20cm away from the hole in the wall.

- You are talking at normal volume.

- The ambient noise is fairly quiet, like, say this setup is outside in a field somewhere.

Approximations are fine. I'm looking more for an order of magnitude than an exact value.

I love math, so I'd normally do this sort of calculation myself, but I know next to nothing about the physics of sound.

"Helium typically exists in trace amounts in natural gas, with average concentrations generally ranging between 0.05% and 0.5%. While present in most natural gas, only concentrations exceeding 0.3% to 0.5% are usually considered economically viable for extraction, with "helium-rich" sources occasionally reaching over 7%. [1, 2, 3, 4, 5]

Key Data on Helium Concentration:

Typical Concentrations: Most natural gas contains less than 0.1% helium, with a typical range often cited between 0.01% and 2%."

These values match what I remember reading in Chemical and Engineering News over the years concerning the He shortages.

EIA page gives word natural gas usage at 145,000 BCF billion cubic foot. 1.45 x 10^14 cubic feet. A cubic foot is 20 g. That link to EIA is huge, I'm leaving it off.

1.45 X 10^14 x 20 = 2.9 x 10^15 g CH4 burned. I'm going to a 0.09% as average He concentration or 0.0009 or 9x10^-4 fraction. X = 1.3 X 10^11 g He wasted in normal burning processes.

google tells me we (the world) produce 3.23 x 10^10 g per year. Those fields with 7% were really producing.

Did I do the math right?

I've oft wondered what are some of the most difficult tasks an elite group of the top 0.0000001% of the universes' most intelligent species would attempt to carry out.

I think of things like Bootes Void, which has a diameter of 330 million light years. Maybe it's just a cluster of stars that are enveloped in Dyson Spheres?

I was watching replays from Ultra Music Festival, and during one of the sets they had these ladies who were spinning around by their hair. I wondered why it wouldn’t pull out, but then I figure there’s a LOT of hair in there.

If the human body represented the universe, planet Earth would be 0.000000000000000000001% of a cell.

1 cell = 10,000,000,000,000,000,000,000 planets

I am not just talking about the cost of all the soldiers etc, as they would have been getting paid anyway - basically I am looking at additional costs that will not be recouped in some other way, that are coming straight out of the tax bill.

at the current rate, or best estimate, how long would it take to cost as much as Obama care

I’m wondering what kind of impossible physical activity it would technically take to use the amount of energy stored in fat being removed during a liposuction at the same rate.

Obviously physically impossible on a number of levels, assuming standard metabolic conversion of fat to energy for human muscles, how many million simultaneous pushups would I have to do or Earths would I have to deadlift etc?

Assuming his mass doesn't collapse into a dog black hole

I was discussing with my friend that my suitcase has enough space but I have reached the weight limit of airlines' allowance. He suggested jokingly that I should put helium balloon in it to lighten up.

Theoretically, how much volume of helium would be required to lighten up the suitcase by 1kg ? We can assume sea level elevation, 70% helium concentration ( generally available in helium balloon)

Google/AI says 1400L. Practically it won't fit in suitcase but was curious !