1. ### Conceptual check: Newton's third law

Homework Statement A spherical rubber balloon inflated with air is held stationary, with its opening, on the west side, pinched shut. (a) Describe the forces exerted by the air inside and outside the balloon on sections of the rubber. Homework Equations ? The Attempt at a Solution The air...
2. ### Why doesn't Newtons third law also apply to the frame?

Homework Statement A locomotive has broken through the wall of a train station. During the collision, what can be said about the force exerted by the locomotive on the wall? a)The force exerted by the locomotive on the wall was less than the force exerted by the wall on the locomotive. b) The...
3. ### Intro to Electromagnetism: five conceptual questions

Hello! I'm working on an online assignment and am on my last chance to submit the right answer, so I figured I'd ask here for some help to see where my reasoning is wrong. Problem: For each of the five questions, I can choose one of four responses: Positive, Negative, Neutral, or Cannot Tell...
4. ### Elastic and inelstic collisions conceptual questions.

Homework Statement The questions showed in the pictures ask me whether the collisions in the drawings could be elastic or inelastic, I am not given any mass, the angles are a little vague but I think B and C are supposed to be π/2 and π respectively. For velocity, I am just given the direction...
5. ### Inductor as a battery in a circuit

Homework Statement Can we consider an inductor as a battery of emf ξ = -## L \frac {dI } { dt} ##? For the above circuit, ##V_A - V_B = V_C -V_D \\ -L \frac {dI } { dt} = IR ## Here, the inductor is acting as a battery of emf ## -L \frac {dI } { dt} ##. For the above circuit, ##V_A -...
6. ### I Electric Permittivity, Magnetic Permeability & Suceptibility

Can anyone please explain me the physical significance of these concepts?? Electric permittivity, Magnetic Permeability & suceptibility
7. ### I Laws of physics and inertial systems

It is not the laws of physics, but the forms of laws of physics which are the same in all inertial frames. Comment. "The forms of laws of physics are the same in all inertial frames" is a necessary condition (put by scientists ) to get satisfied by something which has to be called as a law of...
8. ### I Conceptual Question About Polar Coordinate System

I am learning about the polar coordinate system, and I have a few conceptual questions. I understand that in Cartesian coordinates there is exactly one set of coordinates for any given point. However, in polar coordinates there is an infinite number of coordinates for a given point. I see how...
9. ### Questions on an end of the year project

Homework Statement Hey guys. I am attempting to do an end of the year physics project on gears on bikes and bike ratios. For the presentation I want to explain how gear ratios and the like work and demonstrate a homemade gear. I also need to have and experiment to go along with it. My basic...
10. ### What is Enthalpy Conceptually?

So I understand that enthalpy is energy. But what energy specifically? Is enthalpy heat energy? Is it the energy that bonds atoms together and that's why it can either be released or absorbed? Or is that what Gibbs free energy is? I'm trying to make sense of the equation: ΔG=ΔH-TΔS...
11. ### Increasing speed by decreasing intertia?

Just curious, explanation if youre going to answer please!! 2 horizontal disks stacked on one another spinning at constant v, (about a frictionless axis perpendicular to their center), both have mass. Okay, so lets say its possible to instantaneously remove the top disk. So would that make...
12. ### Chemistry Best Intro Gen Chem Textbook w/ *Conceptual* Questions?

Hello all, I was wondering, what is a really great introductory general chemistry book/source (covers chemical kinetics, thermodynamics, electronic structure, electrochemistry, acid-base equilibria, etc.) that has a lot of conceptual questions and not just quantitative? An example is like...
13. ### Rings on a rod: angular momentum conceptual question

Homework Statement A uniform rod of mass 3.15×10−2kg and length 0.380m rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. Two small rings, each with mass 0.250kg , are mounted so that they can slide along the rod. They are initially held by catches...
14. ### Scientific Laws for Engineering Materials

I have a conceptual question. There is a law in science for every phenomenon in nature, like gravity or electric field. But also there are laws for springs or capacitors etc... I mean the engineering materials that are produced by engineering processes, not can be found in the nature itself...
15. ### Equation of Electric Field

When reviewing Electric field I had some confusion as to what the subscripts on [F][/0] and [q][/0] mean. Also what are we calculating here? I know its the electric field but what does this term mean?
16. ### Need help on designing a conceptual HALE UAV

Hi everyone, I am a High School student (final year) and am doing an extra-curricular project. Having complete autonomy on what we do the project on, I choose to design a High-Altitude Long-Endurance (HALE) UAV, such as the QinetiQ Zephyr [http://www.airforce-technology.com/projects/zephyr/] or...
17. ### Conceptual Newton's Law's Questions - HS Freshman Physics

NOTE: The following questions are not part of any homework assigned. This is part of finding extra concept-related questions to help me study for my physics unit test. Homework Statement I have conceptual questions, not problems. I'll provide sufficient evidence that I've attempted to think...
18. ### Work question

Homework Statement A student holds a book at rest on the palm of her hand. She lifts the book straight up, bringing it to rest again at a higher point. 1. Is the net work done on the book positive, negative, or zero? 2. Is the change in the gravitational potential energy positive, negative...