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Science Questions Threak

post #1 of 244
7/18/10 at 9:47pm
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Edited by merkur - 7/30/11 at 1:41am
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post #2 of 244
7/18/10 at 9:49pm
I was just gonna start something like this!!

Why does wind make us feel cooler?

Seriously. No I won't google it because where's the romance in that?

But yeah, I mean ok I understand if it's cold, more cold wind makes us colder...but when it's hot, why does wind make us cooler as well? After all, it's just more hot air blowing at us. If anything speed heats up molecules even more, amirite?

One of you smart assholes answer me. Or one of you dumb-but-capable-of-googling idiots.
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post #3 of 244
7/18/10 at 9:52pm
Quote:
Originally Posted by merkur View Post
Can anyone tell me how the Apollo 11 astronauts managed to keep the space shuttle flying in space and take off from the moon if there is no atmosphere on the moon and presumably no oxygen in space or on the moon for rocket fuel combustion?
Because space shuttles run on combining hydrogen and oxygen to create water vapor.
Quote:
Originally Posted by MetroStyles View Post
I was just gonna start something like this!! Why does wind make us feel cooler? Seriously. No I won't google it because where's the romance in that? But yeah, I mean ok I understand if it's cold, more cold wind makes us colder...but when it's hot, why does wind make us cooler as well? After all, it's just more hot air blowing at us. If anything speed heats up molecules even more, amirite? One of you smart assholes answer me. Or one of you dumb-but-capable-of-googling idiots.
Because the wind blows away the body heat that surrounds us. Geez, I suck at science and even I know this shit.
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post #4 of 244
7/18/10 at 9:54pm
Quote:
Originally Posted by tagutcow View Post
Because the wind blows away the body heat that surrounds us.

Geez, I suck at science and even I know this shit.

If true, that's interesting. Thanks.
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post #5 of 244
7/18/10 at 9:57pm
Quote:
Originally Posted by MetroStyles View Post
I was just gonna start something like this!!

Why does wind make us feel cooler?

Seriously. No I won't google it because where's the romance in that?

But yeah, I mean ok I understand if it's cold, more cold wind makes us colder...but when it's hot, why does wind make us cooler as well? After all, it's just more hot air blowing at us. If anything speed heats up molecules even more, amirite?

One of you smart assholes answer me. Or one of you dumb-but-capable-of-googling idiots.

The body gives off heat through the evaporation of moisture that's on the skin, and wind speeds up evaporation. Thus, it makes you feel cooler.
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post #6 of 244
7/18/10 at 10:05pm
Quote:
Originally Posted by merkur View Post
Can anyone tell me how the Apollo 11 astronauts managed to keep the space shuttle flying in space and take off from the moon if there is no atmosphere on the moon and presumably no oxygen in space or on the moon for rocket fuel combustion?
All jet engines work by making large amounts of gas that is ejected out the back to push the airplane or rocket in the opposite direction. Jet airplanes carry only high octane jet fuel because there is air to burn to form CO2 and gaseous H2O. As you realize, rockets have no air available, so rocket fuel is composed of two chemicals that react to form a large amount of gas. The gas jetting out the back pushes the rocket forward. I can give a more technical answer, including the chemicals used, if you're curious.
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post #7 of 244
7/18/10 at 10:06pm
Quote:
Originally Posted by MrG View Post
The body gives off heat through the evaporation of moisture that's on the skin, and wind speeds up evaporation. Thus, it makes you feel cooler.

Ding, ding, ding. Evaporating liquid carries away energy (heat), leaving the surface cooler. But you didn't need to be told to go stand under a hose during the summer.
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post #8 of 244
7/18/10 at 10:55pm
If time slows as velocity increases toward c, then if a person theoretically traveled at c couldn't they continually broadcast their actions to an audience that perceives them at the normal rate of time? How would such actions be interpreted by the audience? The broadcaster could do something like, say, recite the Declaration of Independence, but the audience would receive it as if no time had actually past. So the broadcaster is aware of his recital of the Declaration of Independence and it thus would be said to have actually occurred, yet is such an act even perceptible by the audience? And if not, would it actually occur in 'reality'? What if the velocity of the broadcaster was slowed to only near-c? How would the audience then perceive the recital?
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post #9 of 244
7/18/10 at 11:04pm
Quote:
Originally Posted by why View Post
If time slows as velocity increases toward c, then if a person theoretically traveled at c couldn't they continually broadcast their actions to an audience that perceives them at the normal rate of time? How would such actions be interpreted by the audience? The broadcaster could do something like, say, recite the Declaration of Independence, but the audience would receive it as if no time had actually past. So the broadcaster is aware of his recital of the Declaration of Independence and it thus would be said to have actually occurred, yet is such an act even perceptible by the audience? And if not, would it actually occur in 'reality'? What if the velocity of the broadcaster was slowed to only near-c? How would the audience then perceive the recital?

Me no understand deiner Gendankexperiment!!! Is he travelling towards or away from the audience?
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post #10 of 244
7/18/10 at 11:06pm
Quote:
Originally Posted by why View Post
If time slows as velocity increases toward c, then if a person theoretically traveled at c couldn't they continually broadcast their actions to an audience that perceives them at the normal rate of time? How would such actions be interpreted by the audience? The broadcaster could do something like, say, recite the Declaration of Independence, but the audience would receive it as if no time had actually past. So the broadcaster is aware of his recital of the Declaration of Independence and it thus would be said to have actually occurred, yet is such an act even perceptible by the audience? And if not, would it actually occur in 'reality'? What if the velocity of the broadcaster was slowed to only near-c? How would the audience then perceive the recital?

Jesus has limited human speed to 750 MPH so this is not something that could ever happen.
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post #11 of 244
7/18/10 at 11:14pm
if you are travelling at the speed of light you cant transmit anything because the transmittal is also at the speed of light
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post #12 of 244
7/18/10 at 11:15pm
Quote:
Originally Posted by tagutcow View Post
Me no understand deiner Gendankexperiment!!! Is he travelling towards or away from the audience?
Is that relevant? If so, I'm interested in answers for both possibilities.
Quote:
Originally Posted by Mr Herbert View Post
if you are travelling at the speed of light you cant transmit anything because the transmittal is also at the speed of light
Untrue. Why would that preclude a transmission? And if that's the case, assume the broadcaster is traveling only slightly slower than c. How are the broadcasts received and perceived?
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post #13 of 244
7/18/10 at 11:16pm
If "evolution" is correct, why is there God?
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post #14 of 244
7/18/10 at 11:19pm
Quote:
Originally Posted by tagutcow View Post
Because the wind blows away the body heat that surrounds us.

Geez, I suck at science and even I know this shit.

This is right. The wind robs us of an insulating layer.

Quote:
Originally Posted by MrG View Post
The body gives off heat through the evaporation of moisture that's on the skin, and wind speeds up evaporation. Thus, it makes you feel cooler.

Quote:
Originally Posted by thinman View Post
Ding, ding, ding. Evaporating liquid carries away energy (heat), leaving the surface cooler. But you didn't need to be told to go stand under a hose during the summer.

See above. I don't think these are nearly as influenced by the wind, but rather by relative humidity.
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post #15 of 244
7/18/10 at 11:20pm
Quote:
Originally Posted by why View Post
Is that relevant? If so, I'm interested in answers for both possibilities.



Untrue. Why would that preclude a transmission? And if that's the case, assume the broadcaster is traveling only slightly slower than c. How are the broadcasts received and perceived?

Read the Fabric of the Cosmos.
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