Wonders of the Solar System
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Thanks Dave, I understand why Io heats up - I'm thinking more in terms of laws of thermodynamics in that energy can't be created in a closed system (which for simplicity's sake, I'm assuming this is). In the squash ball example, chemical energy is consumed by the muscles in your hand to deform the ball so there is a direct transfer of energy - work is done to create the heat. I just don't see where energy is expended between Io and Jupiter so it appears there is a net gain in energy which fundamentally isn't allowed?
Sarchasm : The gulf between the author of sarcastic wit and the person who doesn't get it.
Tidal Energy.
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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phannon86 wrote:
I've been enjoying the series a lot too, however I'm relagated to watching it on iPlayer on mondays due to the other half wanting to watch a bunch of second rate "celebs" prance around on ice. Shows like that are proper enjoyable, thought provoking TV, wish there was more like it.
The ice dancing? :confused:
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However, he makes me feel old, this whiskerless youth going on about a subject I have loved since early childhood, and him a professor! :)
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Yes, that is a little distressing! :laugh:
me, me, me "The dinosaurs became extinct because they didn't have a space program. And if we become extinct because we don't have a space program, it'll serve us right!" Larry Niven
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However, he makes me feel old, this whiskerless youth going on about a subject I have loved since early childhood, and him a professor! :)
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
And he had a career as a pop-star before that!
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And he had a career as a pop-star before that!
And played Hannibal Lector.
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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Thanks Dave, I understand why Io heats up - I'm thinking more in terms of laws of thermodynamics in that energy can't be created in a closed system (which for simplicity's sake, I'm assuming this is). In the squash ball example, chemical energy is consumed by the muscles in your hand to deform the ball so there is a direct transfer of energy - work is done to create the heat. I just don't see where energy is expended between Io and Jupiter so it appears there is a net gain in energy which fundamentally isn't allowed?
Sarchasm : The gulf between the author of sarcastic wit and the person who doesn't get it.
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It's the graviational gradient which means the side closest to Jupiter gets streched. I think that this will probably mean Jupiter's rotation changes but we will never notice.
Join the cool kids - Come fold with us[^]
Gotta love them Lagrangian Points and the Mexican Hat.
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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Dunno, but Brian Cox makes a good presenter. Worth watching if anybody hasn't seen it yet.
Two heads are better than one.
He also makes a damned good Hannibal Lektor[^]
==================================== Transvestites - Roberts in Disguise! ====================================
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Easy one to answer. Jupiter's gravity is so massive that the differential between one side of Io and the other is significant. This would not be a problem in a two-object system, (ie like Earth-Moon), because the differential would be constant, thus equilibrium would be achieved (assuming tidal forces have acted to keep one face constantly facing the larger body), but in a multi-object system such as that of Jupiter this is not the case. The slight, but perceptable gravitation of the smaller superiour moons would have the effect of pulling the nearer side of io toward them and lessening the stress forces on the Jupiter facing side, thus causing the moon to oscillate. This oscillation would allow frictional heating of the core and thus raising the temperature enough to generate volcanic activity. Also be aware that the space around Jupiter is massively irradiated, thus also providing an energy source. The best way to imaging this is to take a Squash Ball. After a few games of squash, the ball is Hot. Why? Because of the energy put into it via the racket, which causes frictional heating of the rubber, AND compression heating of the air inside. Io is that Squash Ball.
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Thumbs up mann!! :thumbsup: That's very good explanation.
Believe Yourself™
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It's the graviational gradient which means the side closest to Jupiter gets streched. I think that this will probably mean Jupiter's rotation changes but we will never notice.
Join the cool kids - Come fold with us[^]
A similar but different effect happens between the earth moon system. The gravity gradient between the earth and the moon causes a bulge in the oceans on the mooon-facing and non moon facing sides of the earth. However, the earths rotation causes friction against the bulge which means that the bulge leads on the moon side of the earth (it is ahead of the earth-moon line). The consequence of this is that the bulge in turn gives a gravitational kick to the moon that causes its orbit to gradually increase in height from the earth (it is moving gradually further away from it), conversely, the friction between the bulge and the earths surface is causing the earths rotational speed to gradually decrease (our days get longer).
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However, he makes me feel old, this whiskerless youth going on about a subject I have loved since early childhood, and him a professor! :)
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
Dalek Dave wrote:
this whiskerless youth
He's actually 42 and a previous rock band member (Dare - 1989 and D'Ream - 1990s). But, I know what you mean. To me, it just goes to show that you don't have to be in your 50s or 60s to be a professor and that anyone, with the right intellect, can achieve great things.
No trees were harmed in the posting of this missive; however, a large number of quantum states were changed.
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Dalek Dave wrote:
this whiskerless youth
He's actually 42 and a previous rock band member (Dare - 1989 and D'Ream - 1990s). But, I know what you mean. To me, it just goes to show that you don't have to be in your 50s or 60s to be a professor and that anyone, with the right intellect, can achieve great things.
No trees were harmed in the posting of this missive; however, a large number of quantum states were changed.
Hey, I am 42 too! Never played in a band though :sigh:
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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Hey, I am 42 too! Never played in a band though :sigh:
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
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I would rather poke my eyes out with a stick! Personally I was watching 24 and recording WOTSS. (I love Sky+).
------------------------------------ I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave