Things you always wanted to know the answer to [Vol. 4]
Discussion
Ayahuasca said:
popeyewhite said:
Mothersruin said:
Ayahuasca said:
Why does exercise increase body temperature?
Energy, thermodynamics etc...Your bodies metabolic and mechanical means of making energy your muscles can consume is no where near efficient. It produces heat. Which warms you up.
Ayahuasca said:
popeyewhite said:
Mothersruin said:
Ayahuasca said:
Why does exercise increase body temperature?
Energy, thermodynamics etc...One for Petrolheads
I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
Clockwork Cupcake said:
deeen said:
I would guess that the chemical reactions that convert oxygen and sugar(?) into force from a muscle are exothermic, and the body is not mechanically a 100% efficient machine (so will generate "waste" heat).
Yup. Just like an engine. 
Cantaloupe said:
One for Petrolheads
I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
Eh? I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
Bigger the bang the faster the movement of the Piston.
Cantaloupe said:
One for Petrolheads
I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
Heavy car being pushed through a gearbox by a piston. Add more fuel/air to the explosion behind the piston and the explosion will have a greater force. I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
Force= Mass x Acceleration. Increase the force, cars mass/gearing stays the same= greater acceleration/piston speed= higher rpm.
Ayahuasca said:
popeyewhite said:
Mothersruin said:
Ayahuasca said:
Why does exercise increase body temperature?
Energy, thermodynamics etc...When your metabolism speeds up and you are working your muscles even harder lifting those hard sets, your body breaks down more ATP to power itself than normal, producing more waste heat. At rest you are converting less of your energy, so you still stay warm, but don't cook.
Reptiles require heat from outside to help control their body temperature as they do not produce enough. We can do it ourselves, but we get hot.
Basic respiration stuff in school biology should cover this. I had it burned in my brain but that was a long time ago now.
But the basics are that all of our energy comes from chemical reaction and the waste heat of those reactions warm our bodies.
Edited by glazbagun on Tuesday 27th August 23:09
glazbagun said:
Ayahuasca said:
popeyewhite said:
Mothersruin said:
Ayahuasca said:
Why does exercise increase body temperature?
Energy, thermodynamics etc...When your metabolism speeds up and you are working your muscles even harder lifting those hard sets, your body breaks down more ATP to power itself than normal, producing more waste heat. At rest you are converting less of your energy, so you still stay warm, but don't cook.
Reptiles are exothermic and require heat from outside to help power their metabolism. We can do it ourselves, but we get hot.
Basic respiration stuff in school biology should cover this. I had it burned in my brain but that was a long time ago now.
But the basics are that all of our energy comes from chemical reaction and the waste heat of those reactions warm our bodies.
popeyewhite said:
Back to biology class for you!
I may have got my endo and exo mixed up ( ) But I think I'm right. You suggest that it is not ATP conversion but rather "muscles working" but work requires energy which (in us) requires chemical conversion to achieve which releases heat.What do you mean by Muscles Working if not ATP conversion? Friction?
Edited by glazbagun on Tuesday 27th August 23:16
glazbagun said:
popeyewhite said:
Back to biology class for you!
I may have got my endo and exo mixed up ( ) But I think I'm right. You suggest that it is not ATP conversion but rather "muscles working" but work requires energy which (in us) requires chemical conversion to achieve which releases heat.What do you mean by Muscles Working if not ATP conversion? Friction?
Edited by glazbagun on Tuesday 27th August 23:16
glazbagun said:
I may have got my endo and exo mixed up ( ) But I think I'm right. You suggest that it is not ATP conversion but rather "muscles working" but work requires energy which (in us) requires chemical conversion to achieve which releases heat.
What do you mean by Muscles Working if not ATP conversion? Friction?
There is some friction in muscled movement, but you're right that most of the heat comes from ATP breakdown in the muscles. ) But I think I'm right. You suggest that it is not ATP conversion but rather "muscles working" but work requires energy which (in us) requires chemical conversion to achieve which releases heat.What do you mean by Muscles Working if not ATP conversion? Friction?
Edited by glazbagun on Tuesday 27th August 23:16
Along the lines...
We went to the Hammersmith a while ago (january), after the (packed) place was seated, it took about half an hour to become very warm, and hour to get hot enough to remove clothes and after 2 hours it was stifling and almost unbearable. The show went on for an hour after that!.
I don't know if the heating was on (I was told it was not) , but my question being, would the place have reached an absolute temperature after a while, and what would the maximum temp inside have been had we not left after 3 or so hours.
It was at maximum capacity, at the Hammersmith.
We went to the Hammersmith a while ago (january), after the (packed) place was seated, it took about half an hour to become very warm, and hour to get hot enough to remove clothes and after 2 hours it was stifling and almost unbearable. The show went on for an hour after that!.
I don't know if the heating was on (I was told it was not) , but my question being, would the place have reached an absolute temperature after a while, and what would the maximum temp inside have been had we not left after 3 or so hours.
It was at maximum capacity, at the Hammersmith.
Cantaloupe said:
One for Petrolheads
I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
It doesn't. At least not always. I understand how a simple carburettor internal combustion engine works, the 4 stroke principle, the spark plug to ignite the compressed mixture of air and petrol at a set time in the cycle, etc.
But I,ve never heard an explanation why the engine RPM increases when the throttle is widened to let more fuel/air in, people I know who know cars say " It just does ".
Which is not good enough frankly.
Take the case of an engine driving a generator. The engine speed needs to remain constant, as the speed of rotation dictates the frequency of the current generated. In this case, more fuel is added as the load increases, but the engine speed stays the same.
Now take your car, and point it up a steep hill at 30mph in top gear. If you floor the throttle, it is unlikely the engine speed will increase. You may make it to the top of the hill with a falling rpm gauge, but the whole time you have been supplying maximum fuel/air due to a WOT position. So increasing the fuel to the engine does not increase the speed, it increases the force on the piston, which allows more work to be done.
Similarly if you find a nice rally-style yump and drive over it at a fixed throttle position, the moment the car leaves the ground the revs will increase. You haven't increased the amount of fuel/air going into the cylinders, it's just that that same stoichiometric mixture now no longer has to propel the car along, and only needs to turn the wheels/transmission. i.e. the load has decreased dramatically.
texaxile said:
Along the lines...
We went to the Hammersmith a while ago (january), after the (packed) place was seated, it took about half an hour to become very warm, and hour to get hot enough to remove clothes and after 2 hours it was stifling and almost unbearable. The show went on for an hour after that!.
I don't know if the heating was on (I was told it was not) , but my question being, would the place have reached an absolute temperature after a while...
Yes. Newton's Law of Cooling says heat loss is proportional to the excess temperature.We went to the Hammersmith a while ago (january), after the (packed) place was seated, it took about half an hour to become very warm, and hour to get hot enough to remove clothes and after 2 hours it was stifling and almost unbearable. The show went on for an hour after that!.
I don't know if the heating was on (I was told it was not) , but my question being, would the place have reached an absolute temperature after a while...
So eventually the heat generated by all the people equals that lost by the building to the surroundings.
glazbagun said:
popeyewhite said:
Very nearly, but no, it's contraction.
That still requires energy. You can't contract your bicep to lift 15kgs x 30 times without an energy source. That source is ATP and breaking it down releases heat as a byproduct.
Gassing Station | The Lounge | Top of Page | What's New | My Stuff