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[OMK]

B C D G T (something to do with the qwerty keyboard?)

[Tug-Kenny RIP]

Now for sideways thinking
puzzle 7

                             B  C  D  G  ?

The answer is that it's the next letter containing curves and straight lines.  J

Sorry, but a bit childish.  Came from the grandchild !!

ken

[wombat]

Here,s one to discuss;

A train traveling due south at 60mph meets a fly traveling due north at 15mph. When the fly collides with the buffer beam, it ceases to travel north at 15mph and starts to travel in the opposite direction at 60mph. Between the time the fly is traveling north, and then south it must be stationary for an amunt of time. At that time it is in contact with the train, which must therefore be also be stationary.
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
AND
before anybody else says it, whats the last thing to go through the fly's mind?

It's a**e.

The train is not stationary at any point in the collision. It all comes down to momentum - the only way the train would become stationary is if the momentum of the train and the fly matched. If the fly had more moentum than the train then the train would become stationary. Also in the collision, the fly as a complete entity is not at rest. Sections of the the fly do become stationary as the thing changes direction - essentially the front of the fly halts then reverses followed by the middle and then the end. This has a distorting effect on the fly - which is why when flys hit the windscreen of the car they are not the same shape after the crash as before. The pressure built up in the body of the fly as the front reverses while the rear travles at the same speed it was flying at can be enough to burst the body and the fly splats all obver the place

Wom

[omra85]

Now for sideways thinking
puzzle 7
                             B  C  D  G  ?

The answer is that it's the next letter containing curves and straight lines.  J
Sorry, but a bit childish.  Came from the grandchild !!
ken

Ken - very good, however the letter 'C' does not contain any straight lines!
Perhaps the solution would be better described as "the next letter containing a curve"
Moral - never trust grandchildren 
Danny

[Tug-Kenny RIP]

I'll have a word with her.             

[OMK]

• Think of a number.
• Add 7 to it.
• Subtract 2.
• Subtract your original number.
• Multiply by 4.
• Subtract 2.

Is your answer 18?

[dan]

yeap  . my number was 3

[Bunkerbarge]

If you subtract your original number you are removing the only variable.

[OMK]

Dantheman.......... 


The boating modeller has two two-way switches, a light bulb, and a 9-volt battery.
How should he connect the terminals so that either switch can be used to turn the light on or off?

[oldiron]

Dantheman.......... 


The boating modeller has two two-way switches, a light bulb, and a 9-volt battery.
How should he connect the terminals so that either switch can be used to turn the light on or off?

  A standard three way switch wiring scheme.

John

[omra85]

John, that wouldn't work. Follow the circuit if you move the LH switch to the other position ....

This is how standard dual lighting switches in say a hallway are connected.

Danny

[OMK]

"John, that wouldn't work. Follow the circuit if you move the LH switch to the other position ...."

I think you have to visualise the internal switch contacts from his sketch in order to see how it works --  similar to those in yours.
Obviously, the question was waaaaaay easy.
Regarding your (neat) sketch of two-way hall switching, what alterations of the circuit would be needed in order to switch the lamp on/off from THREE separate locations?

[malcolmfrary]

Stick a double pole changeover (DPDT) switch between the two end switches.  You can repeat this as often as you like.  Operating any switch will then change from having a circuit to not, or vice-versa.

[oldiron]

Danny:

 It seems to work for me.

John

[omra85]

You're right John, sorry 
I was looking at the arrow as being the switch lever - and the contacts being the centre and opposite!
Well I know what I mean ....
Danny
 

[oldiron]

"John, that wouldn't work. Follow the circuit if you move the LH switch to the other position ...."

I think you have to visualise the internal switch contacts from his sketch in order to see how it works --  similar to those in yours.
Obviously, the question was waaaaaay easy.
Regarding your (neat) sketch of two-way hall switching, what alterations of the circuit would be needed in order to switch the lamp on/off from THREE separate locations?

  I like your GIF of the circuit, How'd you make that?

John

[OMK]

Stick a double pole changeover (DPDT) switch between the two end switches.

Exactomundo. DPDT toggle or a DPDT slide switch would do it. Alternatively, an Intermediate switch means less-complicated wiring, but, as far as I know, Imtermediate switches only come in the same size as domestic plate switches.

[OMK]

I like your GIF of the circuit, How'd you make that?

Quite easily. All the sketches are drawn with MS Paint, saved in 24-bit BMP format. For Instance, sketch #2 consist of four frames. Each frame is then converted from BMP to GIF format using Paint Shop Pro. The four GIFs are then appended to one file using 32-bit s/w called AniMagic GIF. Each frame is delayed for 2.25 seconds.