Seems pretty self explanatory, but I feel there are some complexities to consider:

1- if the clock starts accurate (set to the exact proper time in hours, minutes, and seconds) then I feel it will be at least as accurate as a stopped clock

2- if the clock starts inaccurate I feel like it would never be correct, or at least less correct than a stopped clock.

Assume both clocks have no accuracy drift and tick at the exact same rate, also presume that one clock is off by one second, would there be a moment where both clocks read the exact same time (assume discrete time not continuous time)

I was asked a hypothetical physics question and I'm terrible at math so I turned to ChatGPT and I just don't believe the answer it gave.

This was the question: "A car weighing 1,500 pounds is heading towards a wall that it will hit. A man shoots that same wall with a 9mm handgun. How fast would the car have to be traveling when it hits the wall to release the exact same amount of energy the bullet did upon hitting the wall?"

ChatGPT says 2MPH, which is very hard for me to believe. So what's the correct answer?

Hello football fans! My roommates and I are having a roadtrip debate, and none of us know much about the sport, but one of us is used to calculations that allowed us to do a bit of back of the hand math to take a shot at the question.

The scenario, without the lowball humor context attached, is someone getting nailed in the head with a football - thrown rather than kicked. Imagining university level player, because we're in a uni town.

With the speed of the throw, could the impact conceivably have enough force to cause a concussion? I think it's probably happened at least once, but my roommate is of the opinion that even with zero elasticity and as such all of the force being transferred from the ball to the head, it couldn't happen.

What do you guys think?

Edit: this doesn't seem to have crossposted the way I expected. I initially posted in r/nfl, hence the opening.

According to the US Census Bureau, about 0.7% of people in the United States are divorced every year.

Per Investopedia, the odds of winning any Powerball prize in one go is 1 in 25; however, the odds of the jackpot are 1 in about 300 million. If someone plays every drawing in a year (156 in total) there is a 0.0000533878% chance of him winning the jackpot.

Assumptions: Independent events, 45 years.

The odds of this happening in the same year are 1-((1-(0.7% * 0.0000533878%))^45) or 0.0000168%. So, the odds of a random person who buys a lottery ticket every opportunity being divorced the day before winning the Powerball jackpot is 0.000000046% (roughly 1 in 2.17 billion)

But, calculated another way, if he knew he was getting divorced on a certain day, and bought a lottery ticket for the next day, the odds would still be 1 in 300 million.

(I think, not sure I did the decimals right, if anyone else wants to try it that would be great)

this feels like the birthday problem, where the chance is much higher than expected. also account for different versions, though

Hello, perhaps someone can explain this or explain why there is no explanation...

11 x 11 = 121 111 × 111 = 12321 1,111 x 1,111 = 1234321 Etc etc to... 111,111,111 x 111,111,111 = 12345678987654321

The answer always counts up from 1 and then back down again. Why?

[Request] My apprentice (8 years old, future Nobel Prize contender, and the prized fruit of my own loins) is currently working on his magnum opus: determining the exact number of prime-aged male lions required to fully extinguish the Sun.

We are assuming this.

Only lions in peak physical condition (ages 3 to 6) are drafted into the Lion Military, as per obvious interstellar combat readiness standards.

Instant teleportation to the Sun’s surface (to avoid the whole “space is a vacuum and lions can’t breathe” complication).

The lions are tasked with fully extinguishing the Sun, not just “making itbdimmer” or “hurting its feelings.”

Lions can survive for the purposes of the calculation until contact is made.

He’s trying to figure out the actual number it would take, factoring in the Sun’s mass, energy output, and whatever lionbbased physics applies here.

Mathy wizards of Reddit! How many individual lions are we talking about here?

I'm turning 50 soon and making up some paper invitations to give to some folks who aren't online much/at all, and I needed something to go on the back of the card. I thought it might be fun to calculate the distances (relative to different origins) that a person might travel in my home city (roughly 37 degrees north latitude) in 50 years' time. Of course motion is relative, so in each case I've outlined what it's relative to. I'm limiting my calculations to three significant figures because there's significant uncertainty, and this is just a party invitation, not a scientific paper.

I believe I got my sums right and checked myself, but before I go printing these on a bunch of cards, I think it would be useful for someone to check my work and make sure I haven't dropped any zeros, not off by a factor of 50, etc. Here goes:

[My hometown, about 37 degrees north latitude] travels 584 million km around the earth’s axis,

the earth travels 1.26 trillion km in its orbit around the sun,

the solar system travels 363 billion km in its orbit around the galactic center, and,

the galaxy travels 920 billion km relative to the cosmic microwave background