# trivia question of the day

#### Van

##### CBMod
CB Mods
Heres a question for a test of weird knowledge.

What does the 64 or 56 refer to when talking about Par cans. Maybe it's easier than I thought everybody prove me wrong ? Of course Bill and Ship you are disqualified from answering

#### soundlight

##### Well-Known Member
1/8ths of an inch. A PAR 64 is 8 inches across, and 8*8=64. A Birdie (PAR16) is 2 inches, so 16 1/8ths of an inch.

#### Chris15

##### CBMod
CB Mods
Departed Member
yeah, what soundlight said.

Divide PAR size by 8, multiple by 2.54 and you have the bubble diameter. (We use the metric system )

#### Van

##### CBMod
CB Mods
**** , That was a lot quicker than I thought ! I didn't think you'd get it that quickly I guess I'll have to think up something harder

#### soundlight

##### Well-Known Member
I'm known for pulling out the weirdest bits of technical theater trivia.

#### ship

##### Senior Team Emeritus
oh' oh' me me.. darn...
Nope, great question. Let's all keep this part of the forum alive no matter easy or hard. Brain tease is a brain tease. A #8 screw is #8 by reference to what given it certainly is not an inch or metric decimal. Simple questions illuminate others even if quickly answered by others.

#### propmonkey

##### Well-Known Member
something to do with the thread spacing

#### ship

##### Senior Team Emeritus
That would be correct if I specified something like #8-32 but in this case I specified only #8 - could be a drywall screw even.

#### sound_nerd

##### Active Member
It's the screw diameter, right? I'm not sure of the system of measurement though...

#### SHARYNF

##### Well-Known Member
This is an example of the wierd way things get classified

If you take the diameter of the head in sixteenths of an inch, take about one and double it you will have the classification
say the head is 6 sixteenths of an inch, that is a 10

Sharyn

#### SHARYNF

##### Well-Known Member
Here is another brain teaser

You have a boat floating in a tank of water with a heavy iron beam inside, you drop the beam over the side into the water, does the water rise or fall in the tank?

Sharyn

#### propmonkey

##### Well-Known Member
neither. the beam displaces the same amount of water in the boat as out.

#### SHARYNF

##### Well-Known Member
And another

If a Boeing 747 sits on a newly designed runway that consists of of rolling belt so that as the wheels roll forward, the belt also rolls exactly in sync, when the jets are developing full thrust will the 747 take off?

Sharyn

#### propmonkey

##### Well-Known Member
if i undertand that correctly, it wont move. its like someone running on a treadmill.

#### SHARYNF

##### Well-Known Member
neither. the beam displaces the same amount of water in the boat as out.

Good guess but not correct, can anyone see the error in the analysis?
Sharyn

#### SHARYNF

##### Well-Known Member
if i undertand that correctly, it wont move. its like someone running on a treadmill.

Lets see if anyone else has other opinions and why

Sharyn

#### Van

##### CBMod
CB Mods
And another

If a Boeing 747 sits on a newly designed runway that consists of of rolling belt so that as the wheels roll forward, the belt also rolls exactly in sync, when the jets are developing full thrust will the 747 take off?

Sharyn

Relativity, it's a ***** ain't it ?

#### SHARYNF

##### Well-Known Member
We will have to see how the various answers go, the answers are not as obvious as most people first think

Sharyn

#### sound_nerd

##### Active Member
Water falls....the weight of the beam inside the boat makes the water rise, but once dropped in the water there is less pressure area on the water, so it falls.

#### Diarmuid

##### Active Member
Ok, on the water question:
If my understanding is correct, then when you put something in something else such as a boat, then it doesnt push down and displace as much as it would out of the boat and just in the water. So basically, I think the water would rise, as the iron would probably while in the boat not be totally submurged, and would probably not displace as much as it would if it was submerged. Of course all of that would depend on various things like whether the water had anything like salt in it, making it more boyannt and the shape and make-up of the boat.

On the Boeing question:

If the wheels are rolling exactly in sync, does that mean the wheels on the belt are also rolling forwards, in which case, the Boeing, would probably take off twice as easy as it would be going at its own full speed as well as the full speed of the rubber belt, thus doubling the planes speed; kind of like one of those flat escalator things they have at airports, where you can stand on it and go at a set speed, or you can walk, whilst standing on it and go at about double your normal walking speed. Of course as soon as it leaves the ground, it could come into problems, because of the way its speed would be almost cut by half... but thats another matter.

Diarmuid

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