albertlee

ok......Now I get 50% of my question.......The Drag = .5 * Coefficientdrag * densityair * Velocity^2 * Area. This also means the force exert by the plane to the air in front, right? I have thought about this equation for some time, and I finally realize that the "velocity^2" is the key of relationship between Thrust and Drag, right? But I wonder why it is written as square of velocity? since it means not the acceleration............According to my conjecture, does the drag equation is after simplified? For example, K.E. = 1/2mv^2, but before simplified, it is = (m*v/t)(1/2v*t)..... Secondly, what does the term "area" in the drag equation mean? Many thx for the responds of all my problems

Thanks, AOM, but that only answers 50% of my question! The other 50% is why dont metals just become single atoms, but bond it together using so-called metallic bond? Any help?

Yes, that's it, YT, if the drag needs thrust, which means this apply to Newton's third law....... Simply, what i wonder is why not Thrust is the action, and Drag is the reaction in one way or another? Sorry for being confused so long, but what I really confuse is always about the Newton's third law as role in "force and flight"...... Any help?

Ok, AOM, As i have said, it is not a matter of bonding anymore here about metal, but is about the elements themselves, which means if, the metals "apply" to covalent bonding, then therefore, they get low melting point.............. Say it more clearly, what cause the metals "apply" to metallic bonding, but not covalent bonding? Any help?

aommaster, I know, the metallic bonding is only for metals, but i am just asking why pure metals can stay in solid, which means have such high melting anf boiling point? I think it is not the matter of bonding anymore, metals just have high melting and boiling points themselves......... I think that is also another best way to identify metals, having high melting point,using not covalent bonding................ Any help?

Ok.....Let me sort it out..........So....., is it possible to have drag without thrust? and secondly, if so, where does the force come from to have the drag? since drag is a mechanical force...... Any help?

Why no one is answering?

As a conclusion..........Why drag and thrust are independable? since the stronger the thrust, the stronger the drag........therefore i think they both apply Newton's third law in some ways.......... Any helps? or suggestions? Apreciate

OOOOOOOOOOO...........Can any body please help? <_>

Anybody please help.........................

Any body please help.................

Any body?

Any body?

Can any body pease help to my last question?

We know that Work = Force*Distance, and Power = Work/Time If Potential Energy of a book is 50 J....And the mass of the book is 1 kg....and the distance is 5m..... How do i calculate the power of the book? in watts? What i do is to transform the the P.E. to K.E., hence the kinatic force is also 50 J.......... In this case, what i want to know is the time....... and the formula for calculating the K.E. is W = 1/2mv^2 so, 50 = 1/2(1)(v^2), 100 = v^2, and v = 10 Since i know the final velocity, and the average velocity would be 5m/s Since i know the distance, it is 5m, then d/v = t, therefore the time is 1s... Finally, 50J/1s = 50 watts....... Is my solution correct? Whether is right or wrong, please give me more complete answers to my aiming question:How do i calculate the power of the book? in watts? Please responds, cheers

Thx to Crash........but....... Any more complete answers to my previous message?

Do polar molecules always have lone pairs? if not, why? Apreciate for the responds

So...... why does pure metal almost always stay in solid? if other non-metals also stays in solid, and dont have valence electrons, either..Wont the non-metals also apply to metallic bonding? Any help? Cheers

Ok....So, can anybody tell me the equation of drag? with also some explanations? Apreciate

Thx for the answer....!

Sorry, still confusing....... It is almost telling the laws in more useful in Physics..... Can anybody tell me why not the thrust equalled to the drag? since according to the Newton's third law.. Any help?

Some one told me that in the ion, we always write oxygen last, although it is positive(since cation always is written first)... for eg, SO4, but why we write OH instead of HO as a compound ion? Any help>

I really wonder why drag force is less than the thrust? just as simple as that...... but it really takes a big time on thinking......... Any help?

So........ What is so special about metallic bonding? since why only pure metals apply to use that bonding? Any help?

Thx to all the responds!!!!!!!