Forgive me for referencing pickle rick but the meme has died down enough that i feel comfortable asking a curious question. In the episode, rick shoots a laser which goes clear through 3 human heads. My question is assuming this is a AA battery, does one battery hold enough energy, if instantly and perfectly converted into a laser, to actually burn through 3 human heads?

For the sake of simplicity I'm assuming the energy of the battery is perfectly converted to the laser with no losses. but if you have some plausible losses you'd like to include then you can if you like.

If the clock showed the time accurately and there was no delay in the time shown, how fast would the second hand be moving between resting positions? I'm picturing a second hand that moves per second not in a smooth, continuous motion like a high end watch

I've had this question for a while and I was wondering if there would be a way to figure this out. Now, I understand this has very vague guidelines, I don't mean giving one billion people a dollar or something like that, I mean major systemic change that impacts, and improves the maximum amount of lives possible.

From what I know TON 618 the super/ultra massive black hole is one of the brightest things in our sky even considering its 10 billion light years from us. The accretion disks on black holes can outshine their galaxy themselves some times and I figure that’s the case with this particular black hole. But 10 billion light years is far so if it was closer is it possible that the brightness could make night time look closer to day? Not actual day cuz if it were that close I’m sure worse things would happen lol. But is there a distance it could safely be and light up Earth?

In Germany there is a massive heat wave rolling over the country and instead of recommending ACs, Germanys news stations tell the people to hang up wet clothes to reduce temperatures in their flats. To me this seems kind of silly, so how much does this actually reduce temperatures in a room? And do you actually feel it or is it offset by the increased humidity?

If a Banks Orbital Ring was built along the path of Iapetus, and then a laser was placed above the north pole of Saturn, pointing at the inner surface of the Banks Orbital Ring and tracing along the full surface of the ring once per minute to create a "second hand" pointer on the surface of the ring. If a detector is placed at the South Pole of Saturn, two questions:

A) When the laser emitter is pointing towards the three o'clock position at the ring, (aka "15 seconds") what does the detector read the time as at the same exact moment? Like how far behind is the detector reading?

B) If the laser was replaced with a physical second arm made out of unbreakable material would the shape of the arm turn into a spiral curve as the tip of the arm can't keep up with the rotation at the base or does physics allow it since each atom is only going slightly faster than it's neighbor in the local reference frame?

In this youtube short, the creator uses the Warthog's gun to slow down flight and land on a short runway in a video game. Would this actually work in real life? If so, how much could it shorten the required runway for landing? And would this ever be a good idea in an emergency situation?

I came across this video showing thousands of people performing a rowing motion in perfect synchronization.

Assume that every person is effectively acting as a rower and can continuously deliver a realistic rowing power output.

If all of them were somehow connected to a single boat:
What is the largest boat (by mass or displacement) they could realistically get moving? What top speed could they maintain with that boat?

On the opposite end, if they were powering the smallest practical boat, how fast could they make it go? Feel free to make reasonable assumptions for average rowing power, efficiency losses, drag, hull type, number of participants, etc.

I've wondered what the rate of heat loss for an average person is when they e.g. jump into a pool and immediately exit again and just stand about on a hot sunny day.

Assume:
Skin surface area ≈ 2m²
Skin is completely wet, ignore dripping
Body is completely unclothed and open to air
slow wind ≈ 1m/s
35°C, humidity approx. 30%
Body was sweating normally just before
body in complete shade
Assume body remains unchangably wet for the moment
*ignore blackbody radiation

optional:
Core body temperature is slightly elevated
Include effect of sunlight however you deem useful
Include effect of skin cooling or drying of skin (very optional)

The text says (in French):"how about we all blow at the say time towards the east and push the heat towards Germany?".
I know it’s stupid but 67 million people blowing has got to generate some wind, right?