Author Topic: NZLWN Quiz (Read 70015 times)

beteljuice · « **Reply #200 on:** June 25, 2014, 11:23:33 AM »

It may be a gnoman like a misshapen egg timer, or it may be an equally odd figure of 8 along the the 'hour' lines of a sundial.

It is a mechanical means of applying "The equation of time" which is a correction for the apparent wobble of the Earths orbit around the Sun.

When applied to a correctly constructed sundial it is possible not only to tell the time, but by the tip of the shadow touching the curve you can also tell the date.

In an alter-ego in the era when our pubs weren't open "all day", I used to hand out credit card sized cardboard ones with opening and closing times on - LOL

Rwood · « **Reply #201 on:** June 26, 2014, 07:14:27 AM »

Two main factors affect the length of the solar day (varies by up to +30 and -17 seconds from 24 hours, from memory): the dominant one due to the 23.5deg inclination of earth's rotation equator to the "solar plane" - a lesser one is the non-circular orbit of the earth around the sun.

gabba · « **Reply #202 on:** June 26, 2014, 08:19:44 AM »

Hi

We'll done everyone. Bit short of time this morning so will post a bit more on this tonight. In the meantime today's ponder

Ice freezes at 0celcius. If I measured thes temperature of ice in the Antarctic, and the temperature had been a consistent -5celcius for some time, what would the temperature of the ice be, and can you support your answer with scientific reasoning?

gabba · « **Reply #203 on:** June 28, 2014, 01:19:27 AM »

Here's the link I was going to post about the analemma
Why Our Analemma Looks like a Figure 8 – Starts With A Bang

Interesting that the analemma looks different depending on where on the Earth you are, and that on most planets, it's not the shape of a figure 8

Wolfie33 · « **Reply #204 on:** June 28, 2014, 09:35:37 AM »

Hi Gabba
Love this section, many thanks for your efforts, interesting & informative.

I'll start off the ice poser. I recall that sea water freezes at a slightly lower temp, some 3/4 degrees I think, & I would guess that once frozen it would continue to cool somewhat due to surrounding cond's, something like convection. No idea what temp the ice would be, but for a stab I'd say -10. Not exactly scientific huh.

Still getting my head around the mist v fog one. Typical of authorities to make it all so complicated. How far can I see? Am I driving or flying? Conceivably possible to be doing both, but not in my wagon

For the sake of personal sanity I think I'll stick to fog descends & mist rises.

And I'm just soooo happy that bubbles do form when you crack the top off a beer!!

Cheers
Pat

gabba · « **Reply #205 on:** June 30, 2014, 07:48:39 PM »

Thanks for that Wolfie33. Time allowing as long as people answer the questions I'll keep em coming.

Yes there are some really cool things that happen to water as it freezes. Aside from that tho, you have the right answer. -10c is correct. Any objects at differing temperature will move to a state of equilibrium.

Wolfie33 · « **Reply #206 on:** June 30, 2014, 11:03:44 PM »

You're welcome Gabba, credit where credit is due & all that.

Had to chuckle at "some really cool things happen to water as it freezes." lol

Cheers
Pat

gabba · « **Reply #207 on:** July 01, 2014, 08:01:36 AM »

Today's puzzler.

What is the maximum allowable wind speed for setting athletic sprinting and jumping records?

TonyC · « **Reply #208 on:** July 01, 2014, 08:34:46 AM »

The figure of 4mph comes to the memory surface for some reason.
That was in the days of the likes of Roger Bannister running the 4 minute mile.......

No doubt it's in Kmh now.

gabba · « **Reply #209 on:** July 01, 2014, 12:44:37 PM »

close (ish). The answer I have is in m/s. If they used 4mph these days there would definitely be a protest lodged!

Wolfie33 · « **Reply #210 on:** July 02, 2014, 08:58:45 PM »

I recall watching some athletics meeting a few years ago where a record was disallowed in the 100 mtr dash. Can't recall exactly, but have a feeling it was 1.4 m/s.

Mark · « **Reply #211 on:** July 02, 2014, 09:25:34 PM »

I don't do sprints but would think 1.8m/s tail wind.

Wolfie33 · « **Reply #212 on:** July 03, 2014, 06:40:02 PM »

Since my last input, been thinking that 1.4 m/s is too high, thought the figure had .4 or .6 in it, so now thinking its 0.6 m/s.

I don't do sprints (anymore) either Mark, more like the 10 mtr rush, trip & hobble these days.

gabba · « **Reply #213 on:** July 05, 2014, 12:20:56 AM »

Some good guesses. The answer is 2 m/s or approx 4.473 mph in the old language.

That one goes to Tony.

Today's question. We all know the value and the role ozone plays in the atmosphere. How is ozone created and What other uses does ozone have?

Wolfie33 · « **Reply #214 on:** July 09, 2014, 08:45:24 PM »

been waiting for someone else to have a go, but its not happening . . .

I consultated Mr Collins dict. 1987 edition which states:
a colourless gas with a chlorine like odour, formed by electric discharge in oxygen, formula O₃, a strong oxidizing agent, used in bleaching sterilizing water, purifying air.

gabba · « **Reply #215 on:** July 22, 2014, 10:31:56 PM »

Sorry I missed this. It's the correct answer as well. Ozone is used for sterilisation

Ok easy one. How many sides has a snowflake?

Wolfie33 · « **Reply #216 on:** July 26, 2014, 08:21:41 AM »

Come on people . . . . !!

beteljuice · « **Reply #217 on:** July 26, 2014, 09:35:31 PM »

6 .... but if you count the inside 7

gabba · « **Reply #218 on:** July 27, 2014, 10:46:13 PM »

Haha don't forget top and bottom, but six seems to be the commonly accepted answer. We'll done.

Wolfie33 · « **Reply #219 on:** December 10, 2017, 10:30:18 PM »

I recently came across mention of the Gunning Fog Index.

What do you reckon that is ??

News:

Author Topic: NZLWN Quiz (Read 70015 times)