Brain busters

[Darkwood]

Close kamikaze but she made a big blunders the third line

 

[Des 56]

Time to waffle some more nonsense from this feeble brain of mine

The air is warmed,the warm air has greater volume,air now needs to vacate the premises or the premises needs to get bigger
The volume of the warmed air is more energetic than previous, but, because there is less of it, the total energy remains the same

 

[Kamikaze]

Close kamikaze but she made a big blunders the third line

She’s a good teacher but she’s no Einstein.

Non-random arrangements of energies are not valued in calculations. Also, since the still air velocity is also zero. Any calculation would involve multiplying, dividing or square rooting by zero. So any answer to that equation would be = 0.

 

[Darkwood]

@Des 56
In a nutshell YES!

Question 4 - Answer

Back to basics, heat a volume of air up and it will expand, lets assume no-one lives in a sealed chamber thus air will not build up pressure but simply leave the room where possible, the air that leaves is directly proportional to the expansion effect by the heating of the air thus the overall energy level of the air in the room remains the same.


Its late so ill post another question tomorrow.

 

[Kamikaze]

Time to waffle some more nonsense from this feeble brain of mine

The air is warmed,the warm air has greater volume,air now needs to vacate the premises or the premises needs to get bigger
The volume of the warmed air is more energetic than previous, but, because there is less of it, the total energy remains the same

Air heats up relatively quickly because air is a gas and has relatively little mass. If the room is cold the air will appear to heat up quickly but once the heating process has stopped it will cool down pretty fast too for the same reason. Air by itself doesn't have the ability to store much energy and the energy input far exceeds the energy actually stored but there definitely is an increase of stored energy because electrons can absorb this energy but admittedly a small one. Since we don’t know the rooms volume, the amount of heat that has been radiated into the room and the stand still air velocity, we can not calculate the increase.

 

[Darkwood]

@Kamikaze ..Back to school for you I'm afraid, Air is a poor conductor of heat for the very reason its a gas, its convection of the air over the radiator that warms the passing thin layer up in a repeat cycle thus gradually heating the room up, if air was a good conductor then your tea would go cold very quickly. This is why air acts as a very good insulator and you find many thermal insulators have thousands of trapped air pockets giving them their insulating proporties.

 

[Kamikaze]

@Kamikaze ..Back to school for you I'm afraid, Air is a poor conductor of heat for the very reason its a gas, its convection of the air over the radiator that warms the passing thin layer up in a repeat cycle thus gradually heating the room up, if air was a good conductor then your tea would go cold very quickly. This is why air acts as a very good insulator and you find many thermal insulators have thousands of trapped air pockets giving them their insulating proporties.

That’s why my school reports kept saying “Must try harder” and “Don’t let him lick the wire”. But I’m just a victim of liberal style over scientific substance. What really hurts is that Des has stolen all the glory again.

 

[Des 56]

That’s why my school reports kept saying “Must try harder” and “Don’t let him lick the wire”. But I’m just a victim of liberal style over scientific substance. What really hurts is that Des has stolen all the glory again.

What should hurt is that I have little to no idea about that subject.I suppose my guess trumped you're own undisputed knowledge of physics,anyway,the question was all a load of hot air, now go to the back of the class

 

[Darkwood]

Question 5 -A Weighty problem.

An Aquaduct (as in a bridge carrying water), is used as a canal, when a canal boat rides over the bridge will the bridge be subject to more weight..ie does the bridge need to be designed to carry the boat as well as the water?

 

[David M]

No, In order for any thing to float an object must displace a volume of water heavier than the actual object. So my guess is, in this scenario as the boat passes over the bridge the actual load on the bridge may even reduced slightly.

 

[Wilko]

Boat displaces its own weight in water and since its an open ended canal (and not a bath) the displaced water moves out along the canal in all directions. So that's a "no" from the rubber duck

 

[Kamikaze]

Eureka! I actually know the answer to this one because I studied Greek scientists and philosophers at the alma mater and the person that solved that particular problem was a personal favourite of mine.

 

[static zap]

Eureka!...... was a personal favourite of mine.

In a streak of inspiration