Recent content by jumbogala

Thanks for the link - it explains perfectly. So in a conductor, the shifting of charges corresponds to the "electron sea" in metals being more concentrated on one end of the object compared to the other. However, in an insulator, the electrons still stay with their molecules, but each molecule...

Homework Statement Hi all. I'm a teacher and one of my students asked me a question I couldn't answer today. It's a multiple choice question: A neutral object is attracted to an electrically charged rod. The two are not touching. The neutral object: A. is a conductor B. is an insulator C...

Homework Statement This is not really a homework question -just something I realized I don't understand. I am confused about binding energy of a nucleus. I understand that the definition of binding energy is the energy required to completely separate the protons and neutrons in the nucleus...

So if the current is constant, does it produce a static electric field or a changing electric field? If it is a constant electric field then I understand why it would not produce EMR. But if it is a changing electric field, then I still don't understand. I thought the idea behind EMR is that a...

I am a high school teacher preparing to teach grade 12 physics for the first time in the fall. I can't quite understand this and it is really bothering me... In the textbook my school uses, it says that accelerating charges produce electromagnetic radiation, while charges moving at a constant...

Homework Statement Hi everyone. I'm a high school teacher. My background is physics and math, but right now I'm teaching a course that involves some basic (grade 10) biology. I don't know much about bio, so I need your help! Right now, we're studying the organelles. I'm trying to put together...

Homework Statement Hi everyone. I watched a YouTube video earlier today which said that sound waves travel faster in more dense mediums. For example, sound travels faster in water than it does in air. However, on this webpage http://www.physicsclassroom.com/mmedia/waves/ltm.cfm it says that...

Homework Statement Hi everyone. I am a grade 11 physics teacher. This week, I will be teaching about Newton's first law in class. I'm having trouble explaining one thing. Students generally understand that a hockey puck moving on ice will continue to move with constant velocity. In this case...

According to the textbook: Dissociate: to break apart to form separate ions (as when ionic substances such as NaOH break apart). This process is not called ionization because the substances are already made of ions. Ionize: the process in which a molecular substance, often an acid, dissolves...

Homework Statement Hi everyone. I'm a relatively new high school chemistry teacher. I'm teaching modified arrhenius theory to my students, and I'm unclear on ionization vs. dissociation. Homework EquationsThe Attempt at a Solution Here is my understanding: - Dissociation occurs when an ionic...

Good to know, thank you! One more thing - is "titrant" always the solution of known concentration, or just the name for the solution that goes in the buret? It's hard to find a clear answer online.

Homework Statement Hi everyone. I'm teaching introductory chemistry this semester, but I don't have much of a chem background. We are about to start acid base titrations. Does the standard solution of known concentration go in the buret tube or the erlenmeyer flask? Does it matter? Homework...

Yes, this is exactly what I'm talking about! I understand that there are situations where acceleration has to be treated like a vector quantity (such as in Mark44's post). So it would actually be incorrect to say that acceleration can ever be scalar?

Homework Statement I am a teacher currently teaching very introductory physics. I just came across a test question asking the students to choose whether acceleration is vector or scalar. Homework EquationsThe Attempt at a Solution I have always thought that acceleration can be either vector or...

Okay, that makes sense. In this case, the amount of water doesn't matter anyway. Thanks!