Cumulative General Science/Technology Quiz

[Aramazd]

Yeah, stickciv got it.

 

[Genocidicbunny]

Alright: what is a bomb calorimeter? How does it function?

 

[ainwood]

A bomb calorimeter is a device for determining the energy content of something - normally the energy released during an exothermic reaction. Basically, you put the reagents in and ignite them. The bomb calorimeter is normally in a water bath, and by measuring the rise in temperature of the water (and the bomb itself), you can work-out the energy released.

Bomb calorimeters are contant volumes measurements, not constant pressure.

 

[Souron]

Alright: what is a bomb calorimeter? How does it function?

I don't know, but by the name I would guess that is measures energy output. The most strait forward way to do that, would be to measure force exerted by the explosion. I imagine something like a heavy duty spring scale, fixated the bomb, while the bomb is kept in a heavily reinforced enclosure, so that most of the energy goes to the scale. Bomb, explodes, spring compresses proportional to the energy.

EDIT: Ainwood hadn't posted when I started writing my post. But if It takes me 8 minutes to type out an answer, I should probably check to make sure someone hadn't posted in that time.

 

[Genocidicbunny]

A bomb calorimeter is a device for determining the energy content of something - normally the energy released during an exothermic reaction. Basically, you put the reagents in and ignite them. The bomb calorimeter is normally in a water bath, and by measuring the rise in temperature of the water (and the bomb itself), you can work-out the energy released.

Bomb calorimeters are contant volumes measurements, not constant pressure.

Correct

I don't know, but by the name I would guess that is measures energy output. The most strait forward way to do that, would be to measure force exerted by the explosion. I imagine something like a heavy duty spring scale, fixated the bomb, while the bomb is kept in a heavily reinforced enclosure, so that most of the energy goes to the scale. Bomb, explodes, spring compresses proportional to the energy.

Not quite, read what Ainwood wrote.

 

[ainwood]

Explain how a heat pump works.

 

[LAnkou]

well, it's a thermodynamic system where you transfer heat from a first system (the interior of your fridge) you want to freeze to another system (in general a fluid) that have been artificially frozen and who will pass the heat to a third one (in general the air). All the trick is about the fluid that pass between four transformation playing with volume, temperature and pression: first a diminution of the volume at the same temperature (augmentation of the pression), then a diminution of the pression at the same volume (diminution of the temperature). At this moment, the fluid is colder than the first system (the fridge), so the first system by giving heat to the fluid get colder and the fluid get an augmentation of the temperature at the same pression (augmentation of the volume), then the heat is transfered from the fluid to the third system, so the fluid get a diminution of the temperature at the same volume (diminution of the pression). The heat has been pumped from the fist system to the third...

T= temperature, P=Pression, V= Volume

V<, P>, T=
V=, P<, T<
V>, P=, T>
V=, P<, T<

I think it's something like that. I validate this answer and now will see for me if it's a good one...

 

[Perfection]

It pumps heat.

 

[ainwood]

I think it's something like that. I validate this answer and now will see for me if it's a good one...

Largely correct, but I was also looking for some more info (for example, the efficiency of a heat pump, and an explanation for it).

 

[LAnkou]

So I can ask a question?

well, let's get into some science history....

Who were the last two person to get a nobel prize of physics all by themselves (not sharing it with anyone else...)?
Bonus questions: years, nationality and works they were awarded for!!!

 

[brennan]

Who's going to get that without research?

I'll guess that one of them was Einstein 1915(?) for the Photoelectric effect. He was German at the time. Or was he Austrian?

 

[brennan]

I checked. Wrong on pretty much every aspect.

 

[dutchfire]

I think it never happened (that's the only way I'll get the bonus question right).

 

[LAnkou]

it happened 47 times....indeed Brennan was very wrong!!!

 

[Catharsis]

Raymond Davis? For the neutrinos and stuff.

 

[LAnkou]

nope...

By the way, I asked the last two and everyone is giving me only one name. Maybe it's too hard, so let's limit it to the last one. (I will give the two names, just for information).

 

[nonconformist]

Glenn Seaborg
Linus Pauling?

 

[ainwood]

So I can ask a question?

What I was looking for was also something along the lines of that the heat rejected = heat extracted plus work done; in comparison to something like a bar heater, where heat rejected = work done.

 

[peter grimes]

I thought of Linus Pauling as well, but I'm pretty sure he won for Medicine.

Seaborg is a possibility, but didn't he win for Chemistry?

 

[nonconformist]

Possibly Niels Bohr then?