Alanna, he means die as in kill,

quote:

Originally posted by curiousponderer:
I always liked if cold sinks why does the top of a lake freeze first.

because ice is lighter than water so it floats

my 500th post!

For number two. If you jack the car up you could use the lug wrench on the lugs to turn the wheels as if you were starting an airplane at the propeller. Being it's most likely a four cylinder it shouldn't take much to get the engine to turn over.

450rmack

ding, ding, ding! We have a winner!

I haven't tested this method. But people sometimes got their arms broken by crank starting old cars. I have used the lug wrench to turn a wheel, rolling a car up a hill which I would be unable to without this mechanical advantage.

Alanna

I really like your answers, especially 1die-2dice

quote:

aduth..etc
because ice is lighter than water so it floats
my 500th post!

I have curiously pondered that and in addition I have two more factors.
Water pressure reduces the freezing point so the lower water under higher pressure has a lower freezing point so the top would freeze first.
The other is the land that contains the water is probably warmer than the air over the water as frost level might be 7 feet or so, but congrats on your 500th post and I think ice floats is the #1 answer also.

in response to the question about voltage. as was mentioned earlier, it depends on the amps. here's a video that clearly demonstrates that a high voltage doesn't translate into severe pain: http://video.google.com/videoplay?docid=373307001340301...ype=search&plindex=1
that's 950,000 volts, and the people in the video react in a similar fashion to someone who just got pinched.

quote:

curiousponderer
Senior Member
Registered: 02-17-08
Posts: 176



I have curiously pondered that and in addition I have two more factors.
Water pressure reduces the freezing point so the lower water under higher pressure has a lower freezing point

Interesting hypothesis.

Also on the matter of ice, i have seen ice form at an ambient temp of 40f. What is that , um about 5 c? somewhat above the freezing pooint of h2o. I was washing my car and figured 40 f would be ok. What caused this? Same mechanism might contribute to streams and lakes freezing over.

I work as an electrician, and have been shocked a few times. One time I accidently touched a 480V conductor, while I was standing in water. The current hit me in my hand and went all the way through my body. I tensed up instantly, so much that my muscles ached for days. But, that wasn't the worst I got hit.

Last summer, I was working on a supposedly "dead" circuit carrying 277V. It was located above a drop ceiling, and I was standing on a ladder. When I tried to remove the insulation from the "dead" wire, I got a shock in one hand, through my body, and out my other hand where I was holding the grid. I blacked out and fell to the floor. The only thing that saved me was the breaker that tripped. The breaker was a forty amp breaker, and tripped in about a second, so the actual current was probably about 100 - 200 amps. That's 25,000 - 50,000 watts!

Let me tell you, that hurt! No lasting damage, only a few small burn spots on one finger.

Lesson learned, make absolutely sure that a wire is dead before working on it!

Fun Post, because you are alive just-the-facts. In college my landlord assured me the old 220 outlet was dead and as the new gas stove would not go to the wall as cord with a 220 outlet was in the way. I took a steak knife and started cutting through it, The steak knife ended up with half the blade blown off during the short, I was ok, but learned never trust anyone and test it before you cut it.
RE: toga_dan I don't know the answer but wonder if wind chill factor comes in to play.

I got another tempature puzzle 4 all u geinuses:

If hot air rises, how come its always the top of the mountain that's the coldest?

Because the major source of heat that is warming the air is the earth's surface.

So if I stuff dirt in my shirt, I'll be warmer?

Yep ducto, stuff lots and lots of dirt in your shirt.

Regarding the boiled egg thing, I boiled one for an hour and a half, then let it cool to room temp on it's own.

Dropped from 6 feet, it did not bounce exactly, but neither did it break. tossing it up about 20 ft to fall back to concrete, it started to break. After doing this a few times, it broke in half.

Not quite "rubber ball", but pretty tough.

quote:

ducto560
Member
Registered: 02-14-08
Posts: 39

Posted 03-26-08 04:35 PM Hide PostReply With QuoteEdit or Delete MessageReport This Post
I got another tempature puzzle 4 all u geinuses:

If hot air rises, how come its always the top of the mountain that's the coldest?

Let's see, if PV=nRT (Pressure times Volume=amount of gas times a constant times temp) And you decrease the pressure of a gas (as happens at altitude) then the temp decreases in proportion to the decrease in pressure.

PV=nRT is the ideal gas law.

New one:

John does mobile catering. His catering truck has been losing power. His mechanic says it is likely to be either fuel filter or pump. After replacing the filter, it still lacks power. johns mechanic says that these fuel pumps don't quit all at once, but deliver a fraction of the engines need when they are getting ready to quit. John's mechanic cant get that pump in until next week, and John has a wedding to cater today.

How can he get to the wedding?

John's resources:
the truck
Egg salad
tuna salad
100 lbs ice
bratwurst
hamburgers
buns
wedding cake
paper plates
a propane grill and steam table
2 propane tanks
paper plates and cups
100 feet of water hose to fill the steam table
His assistant, Jill
a swiss army knife
a roll of duct tape

Build yourself a propane powered or assisted vehicle with Jill operating the valve as needed to regulate the fuel. But only use one tank or the BBQ is off!

And good luck cranking the engine through the wheel! Take out two spark plugs to make it easier, drive part way up the hill on two cylinders, stop, put the plugs back in and bump start the car.

Very good, oldguy! I included the hose and duct tape to let you get propane to the engine.

I actually did this with propane for a while until I got round to changing out the fuel pump. I got the idea from a mech who was using propane to see if an engine was running rich or lean.

I've heard of taking out a couple spark plugs to make starting easier. I wonder about the risk of pumping fuel air mix into the engine compartment.

Just ground the "extra" spark plug wires (pretend a bolt head is a spark plug) and you should be fine. That little fan in there will take care of most of it, and what's left will be too diluted to ignite with anything but an open flame - maybe not even then.