Dman2680 (November 30, 1999 at 12:00 am)

For students who need to see to understand, experiments are essential also for practice All "stuff" is made up of particles and when heated these particles react in different ways in the solid they go "mental" and try to move out thus expansion. Solids liquids & gases expand when heated. As for the bimetallic strip, coefficients of expansion means one bends easier then the other. Brass is more mallable it is easier to work with and bends easier it bends on the brass side thus PULLING the iron.

mykartik (November 30, 1999 at 12:00 am)

I wish my physics teacher was like this. The class would have been so exciting. instead, we get handed work that we have to figure out ourselves or else we fail the class.

endertrask (November 30, 1999 at 12:00 am)

you want a cookie

NSSHcentral (November 30, 1999 at 12:00 am)

My Physics teacher teaches Thermal Expansion way better than this guy.

tezb2 (November 30, 1999 at 12:00 am)

You're supposed to try to figure it out, and then do the experiment. Make sense? What's the point of never knowing the answer for sure? I did know the answer to the hole question, but have forgotten. Regarding the metal strip, I feel that it bends toward the iron side, as he showed in another case that brass is a good thermal conductor and thus will expand more, or will it even expand at all?

Adkit2 (November 30, 1999 at 12:00 am)

you're not really supposed to DO the experiments to find out the truth, you're supposed to figure it out using common sense and the physics. thereby getting a better understanding of it. instead of just doing the experiment then writing down "yes or no" on a paper which teaches you nothing.

goodnightsty (November 30, 1999 at 12:00 am)

No! Categorically false, my friend. The hole will surely expand. Supposing for a moment that the hole were not present, but were indeed filled - would not the anti-hole expand as readily as the rest? Surely it will! Removing the hole does nothing to evade this fact, one of which I encourage you to discover for yourself. Fantastic, I say. Fantastic.

boxiness (November 30, 1999 at 12:00 am)

the hole get smaller i think... the aluminum expands equally in all directions including around the hole, therefore decreasing its radiusbut I do wish he could answer his questions 'cause none of us have got the equipments to do the actual experiments

GreenFighter (November 30, 1999 at 12:00 am)

NO! my head will explode, tell me what happens to the hole!!!