Some questions I need the answers for

[Tomoyo]

- How high do most ravens fly?
- How fast do most ravens fly?
- How fast is a normal human's fastest run?
- What's the formula for when you launch something at a 180 degree angle at a certain height with a certain force in a certain gravity?
- Is liquid water compressible?
- How do people walk on coals?
- How long could a normal, healthy, 20 year old human walk on a road in one hour?
- Same question as above, but for a wolf.
- Do capes have any practical function?

 

[blackheart]

How do people walk on coals?

I'm assuming you meant hot coal. There's two reasons. One is because the side of the coal that isn't being burned is dramatically cooler than the side that is. The other has something to do with human perception and sense, I read it in a Psych book somewhere and cannot remember.

 

[WillJ]

Just curious, what in the world are these for?

How fast is a normal human's fastest run?

15 mph, I think.

Is liquid water compressible?

Unlike most other substances, water's compressibility decreases as its temperature increases, although I still think it's not considerably compressible in its liquid state.

I'm assuming you meant hot coal. There's two reasons. One is because the side of the coal that isn't being burned is dramatically cooler than the side that is. The other has something to do with human perception and sense, I read it in a Psych book somewhere and cannot remember.

I think the first reason is the main reason, in that coals aren't very good transmitters of heat.

 

[viper275]

How fast do most ravens fly?

http://www.npwrc.usgs.gov/resource/othrdata/migratio/speed.htm

22-28 miles per hour.

Is liquid water compressible?

I'm pretty sure it is... Just not much.

 

[blackheart]

I think the fastest person was recorded running at 22 or 25 mph, and it was only a short sprint.

 

[Perfection]

I'm assuming you meant hot coal. There's two reasons. One is because the side of the coal that isn't being burned is dramatically cooler than the side that is. The other has something to do with human perception and sense, I read it in a Psych book somewhere and cannot remember.

I think the first reason is the main reason, in that coals aren't very good transmitters of heat.

Psychological reasons is bullcrap, the temperature arguements are crap as well, the real reasons are
1: Coals don't store much heat
2: Coals transfer heat slowly
Think of it like taking an angel food cake out of the oven, you'll burn yourself on the pan, but not on the cake even though they both are at the same temperature.

- What's the formula for when you launch something at a 180 degree angle at a certain height with a certain force in a certain gravity?

What quantiy do you want the formula to solve for?

- Do capes have any practical function?

Yes, hiding automatic rifles, grenade laucnhers and other large weaponry.

 

[blackheart]

Psychological reasons is bullcrap, the temperature arguements are crap as well, the real reasons are
1: Coals don't store much heat
2: Coals transfer heat slowly
Think of it like taking an angel food cake out of the oven, you'll burn yourself on the pan, but not on the cake even though they both are at the same temperature.

Mind over matter. Coals transferring heat slowly is the same as one side burning and the other side being cooler. BTW, angel food cake isn't made of the same material as coal, different materials burn differently. He didn't ask if it would burn, just how people can walk on them.

 

[CruddyLeper]

Liquid water compressible; no, but it usually contains some dissolved gasses which are forced out under pressure.

So SLIGHTLY... but pure liquid water isn't compressible under standard temeperature. If you freeze it, the density is slightly less (why icebergs float, but not well).

Capes have a multitude of roles when you're "on the road". Windbreak, towel, weapon, shield, garotte. All kinds of uses.

 

[Perfection]

Mind over matter.

There is no psychological role. Unless you get really sweaty feet when your anxious.

Coals transferring heat slowly is the same as one side burning and the other side being cooler.

No, because all of the coal can be burning, or be at a uniform temperature.

BTW, angel food cake isn't made of the same material as coal, different materials burn differently.

I was making an anology to angel food cake, coal doesn't give you burns in the same way that angel food cake doesn't.

He didn't ask if it would burn, just how people can walk on them.

By burn I meant burn your skin, not the combustion reaction.

 

[Tomoyo]

What quantiy do you want the formula to solve for?

Oops. Sorry, it's distance.

 

[Perfection]

D=v*sqrt(2H/g) where v is initial velocity H is height and g is the gravitational field strength.

 

[Tomoyo]

D=v*sqrt(2H/g) where v is initial velocity H is height and g is the gravitational field strength.

Forgive my ignorance, but what is the g for Earth? *please be one, please be one, please be one*

 

[newfangle]

9.81m/s^2 .

 

[Chairman Meow]

9.8 meters/second^2, or 32 feet/second^2

edit - Newfangle beat me to it

 

[wakkoxc]

- How high do most ravens fly?
- How fast is a normal human's fastest run?

A 10 second 100 meter dash averages about 22 MPH, world class sprinters will reach a peak speed of around 28 MPH. I'd the guess average person probably runs 100 meters in 12-13 seconds, they'd probably reach a peak speed somewhere in the low 20's.

- Do capes have any practical function?

If you're planning on having a wolf chase you down a road of coals for an hour and then springboard off some sort of apparatus that will launch you into the air at a 180 degree angle, only to be caught by a raven and dropped on to a water bed. Than the answer is yes, you should wear a cape.

 

[snipelfritz]

- How fast do most ravens fly?

"What is the airspeed velocity of an unlaiden swallow?"

If you're planning on having a wolf chase you down a road of coals for an hour and then springboard off some sort of apparatus that will launch you into the air at a 180 degree angle, only to be caught by a raven and dropped on to a water bed. Than the answer is yes, you should wear a cape.

LOL. If you don't mind me asking, why do you need this information.

EDIT: I forgot. I thought all liquids were uncompressable. Is water some exception?

 

[blackheart]

EDIT: I forgot. I thought all liquids were uncompressable. Is water some exception?

They are, just requires a great deal of pressure to.

http://www.physlink.com/Education/AskExperts/ae15.cfm

 

[puglover]

- Do capes have any practical function?

What self-respecting runescape nut would live without a cape?

 

[Tomoyo]

This is all information I need for my RPG game at my forum.

And as a former runescape nut, I know that capes used to increase your armour by 2, unless it was a black cape.

 

[Yom]

"What is the airspeed velocity of an unlaiden swallow?"

African or European?

If you're planning on having a wolf chase you down a road of coals for an hour and then springboard off some sort of apparatus that will launch you into the air at a 180 degree angle, only to be caught by a raven and dropped on to a water bed. Than the answer is yes, you should wear a cape.