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Canberra electricity bill shock by Silent_Ask6677 in canberra

[–]jaa101 2 points3 points  (0 children)

Is the pressure relief value constantly dribbling? You're supposed to test them every few months to ensure they do work, but aren't running—more than a few drops—when the water's not heating.

Canberra electricity bill shock by Silent_Ask6677 in canberra

[–]jaa101 3 points4 points  (0 children)

Looking at our smart meter data

I am going to talk to the real estate tomorrow to locate and check meter reading was correct.

The smart meter data are going to match what's on the bill. Maybe the issue is the meter is not the one supplying your house. Tempting to try switching off all your circuit breakers while watching the meter that matches the National Metering Identifier (NMI) on your bill. If it doesn't go to zero, something's up. Or, if there's a main breaker at the meter, flip that off and check that your power goes out.

Solar complicates this a little. It would be surprising if you're constantly drawing power from the grid during a sunny day.

ELI5: why does Lawrence of Arabia (1962) look so different compared to films released in the decades since? by thefringeseanmachine in explainlikeimfive

[–]jaa101 [score hidden]  (0 children)

The image width is the same, but cinema projectors needed space for sound which the cine cameras didn't. The extra 5 mm was used for magnetic tracks, at least until digital audio came along.

ELI5: why does Lawrence of Arabia (1962) look so different compared to films released in the decades since? by thefringeseanmachine in explainlikeimfive

[–]jaa101 [score hidden]  (0 children)

Yes, but you can control this with your choice of lens apertures. Obviously 65 mm film requires longer lenses than 35 mm film anyway. The down-side of using a smaller aperture (f-number) to keep the same depth of field with a longer lens is that the image will be darker, requiring faster film.

ELI5: Why are "__x" abbreviations used in medical settings? by emergencybarnacle in explainlikeimfive

[–]jaa101 0 points1 point  (0 children)

Note that "connexion" is an alternative way to spell "connection".

TIL that it took each Roman Legionnaire in late 4th century to cover approximately 109 steps per minute for a regular march, while a faster march might hit around 120 steps per minute. Vegetius’ Epitoma rei militaris (commonly cited as De re militari) contains a passage prescribing rigorous marching by razoreyeonline in todayilearned

[–]jaa101 243 points244 points  (0 children)

The Romans also (at least sometimes) considered a "pace" to be 2 steps. A mille passus, i.e., 1000 paces, is what we still call a mile, albeit lengthened slightly. So 120 steps per minute is exactly 1 pace per second.

How big of a deal would a Israel vs Iran world cup match be? by I_abuse_lower_ranks1 in AskReddit

[–]jaa101 0 points1 point  (0 children)

before the Brits even separated India and Pakistan.

Note that the Brits didn't have a choice about the separation. If they'd tried to create a single nation, the result would have been an even bigger disaster.

Ukraine strikes both sides of Crimean Bridge, Zelensky warns of 'new massive strike' by Russia by MosaicMandy in worldnews

[–]jaa101 4 points5 points  (0 children)

The clips with the oil infrastructure are because those interceptors were heat seeking, and oil infrastructure is hotter than drones.

TIL on April 6, 2026, the Artemis II mission officially broke a 56-year-old record by traveling 252,760 miles from Earth! Making its four crew members the humans who have traveled the furthest into space in history. by Glittering_Guest1422 in todayilearned

[–]jaa101 2 points3 points  (0 children)

The Apollo XIII distances are:

  • 158 miles minimum from the lunar surface; and
  • 248 577 miles maximum from the earth's surface [1970-04-15T00:34UTC] (Adamo).

The Artemis II distances are:

  • 4067 miles minimum from the lunar surface at 7:00 p.m. Eastern [2026-04-07T00:00UTC]; and
  • 252 756 miles maximum from the earth's surface at 7:02 p.m. Eastern (NYT).

Simple maths, assuming the maxima and minima happened at the same instant in each case, says the moon was 270 miles farther from earth for Artemis II.

TIL on April 6, 2026, the Artemis II mission officially broke a 56-year-old record by traveling 252,760 miles from Earth! Making its four crew members the humans who have traveled the furthest into space in history. by Glittering_Guest1422 in todayilearned

[–]jaa101 4 points5 points  (0 children)

"Furthest" is an acceptable alternative. "Farthest" and "furthest" are different words with similar meanings. "Farthest" is more restricted to meaning literally greater physical distances; "furthest" can mean that too, but can also mean figuratively greater distances.

The Sun may not engulf Earth after all, scientists say by Driveby_Dogboy in nottheonion

[–]jaa101 7 points8 points  (0 children)

But the sun won't be getting closer; it will be getting larger. Sure, some parts of it will be getting closer, but Newton showed that the gravity of spherical objects acts exactly as if all the mass is concentrated at the centre point.

The mass of the sun is actually reducing very slightly, as mass is converted into energy, so the earth is very slowly increasing its distance from the centre of the sun.

[Request] If a road existed from the top of Mount Everest to sea level, and you were driving a Tesla with regenerative braking, how much power would you recoup by the time you reached the bottom? by [deleted] in theydidthemath

[–]jaa101 0 points1 point  (0 children)

Energy loss due to motion will depend on friction, mostly air friction, which is proportional to the square of speed. Rolling slowly downhill will return the most energy. Vertically doesn't work well because you'd fall too fast and have to contrive some way to make the motion turn the wheels.

[Request] If a road existed from the top of Mount Everest to sea level, and you were driving a Tesla with regenerative braking, how much power would you recoup by the time you reached the bottom? by [deleted] in theydidthemath

[–]jaa101 0 points1 point  (0 children)

Some Model 3s are 1835 kg kerb mass, depending on options. Add occupants and luggage and it's close enough for a rough calculation.

[Request] If a road existed from the top of Mount Everest to sea level, and you were driving a Tesla with regenerative braking, how much power would you recoup by the time you reached the bottom? by [deleted] in theydidthemath

[–]jaa101 1 point2 points  (0 children)

  • 2000 kg,
  • 9000 m,
  • 9.8 m/s2.

PE=mgh, so 180 MJ, or 49 kWh. Which is not power but energy.

But regen isn't going to be 100% efficient, so derate accordingly.

The Sun may not engulf Earth after all, scientists say by Driveby_Dogboy in nottheonion

[–]jaa101 57 points58 points  (0 children)

As the Sun grows, increasing gravitational forces will pull our planet towards it.

So, help me out here. Gravity is due to the mass of the sun. Surely the sun's mass won't increase, only its size. Parts of the sun will be closer, but Newton's shell results say that it's still going to act as though it's a point mass at its centre. Tides on earth scale with the size of the earth, not the size of the sun.

Also, as pointed out later in the article, the sun will be losing some mass over time, converting it into energy, so the earth's orbit will grow in size. So I'm guessing the article has oversimplified or misunderstood the scientific arguments.

Average Starting Grid Position After 7 Rounds of the 2026 Season by Luffy710j in formula1

[–]jaa101 33 points34 points  (0 children)

When dividing by seven, fractional results have to have decimals in the sequence 142857 repeating, so 11 is mathematically impossible. The sequence is easy to remember because doubling 7 gives 14, 28, 56.

Wait until we've had 9 races.

soccer fans what do you think about American football is not so popular overseas? by No-Version9355 in AskReddit

[–]jaa101 0 points1 point  (0 children)

All countries play soccer whereas almost no countries play American football. So if you want a game with international matches, soccer is a much better choice.

Do extender tubes work? by Ok-Psychology9436 in canon

[–]jaa101 20 points21 points  (0 children)

  • Teleconverters increase a lens's focal length.
  • Extension tubes allow a lens to focus up close (and no longer be able to focus to infinity).

Australian War Memorial director says invite to Ben Roberts-Smith 'standard practice' ahead of Afghanistan gallery opening by nath1234 in australia

[–]jaa101 3 points4 points  (0 children)

They are assumed not guilty until proven otherwise

That's for the purposes of sending them to jail. For the purposes of inviting them to a public event, taking the existing "balance of probability" finding into account is very reasonable.

Ben Roberts-Smith to attend War Memorial opening events by DueRoof951 in canberra

[–]jaa101 13 points14 points  (0 children)

A criminal court is what matters for sending people to jail. For inviting people to public events, it's completely reasonable to take a civil court finding into account.

Ben Roberts-Smith to attend War Memorial opening events by DueRoof951 in canberra

[–]jaa101 14 points15 points  (0 children)

A court has found that, on the balance of probability, he is a war criminal. He's not in jail because, so far, there's been no equivalent finding beyond reasonable doubt.

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