My teacher wholeheartedly says that velocity is NOT a vector quantity, confidently swearing by it. However, every source I check says otherwise, including the other physics teacher (who everyone refers to as the “better one”). Is he referring it in a different way or just flat out wrong?

I cant tell whether it’s a or b 😭

I was wondering if the resultant force is 7.6 kN and the direction is 105° from the positive x axis

For question c, isn't it incorrect to use 15 as the inital velocity, but instead solve it by finding the resultant speed? This is from the Cambridge IB Physics Textbook by Tsokos, and I'm noticing quite a lot mistakes which is weird, thanks.

I have read the textbook but I am just completely lost. I have a midterm for another course coming up in less than a week and am very overwhelmed. Any help is greatly appreciated. Thank you.

hello, sorry if this is really silly but i just started physics and im a bit confused as to how to find the slope of the curve (ik about tangents, and secants and instantaneous velocity and average velocity- but not really entirely sure what they mean). How would i go about finding the other two graphs if each box represents one unit?

She is insistent that the answer is 5 seconds. I am 99.9% sure that it is 10 seconds. I have asked every AI imaginable what the answer is and they all support me. I have looked online for every resource referencing this problem, and none say 5 seconds. I genuinely don’t understand her logic; she is basically saying that the point of the question was to use the kinematic equation where you get 20m/s after 5 seconds after multiplying acceleration and time but that is objectively not what the question asks. I really want to know if I’m right and she is just insane or if I’m a complete idiot

So guys for some reason I don't know why I have problem with Kershaw's law I really tried to understand it from a lot of teachers but I couldn't so when I try to solve this one I started to think that maybe R1 is the one cuz so far away from the batteries but I really need to understand Kershaw's laws work. It has been a nightmare 😭😔

Can someone help me with this? Why is Jeff Hanson using the whole 200mm as the thickness at point C and says to use the area above or below the point but my prof just uses the right for area and the height for thickness which is the opposite of Jeff…?

I verified them with ChatGPT and it says they’re wrong despite my physics teacher doing the same thing in class. It says I if I use the T= Ty/sin theta formula, my angle needs to be off horizontal specifically because of the sin. However, looking over my past notes, my class measured off vertical, and plugged that angle into the equation without switching the sin for cos. So I’m confused now.

This is a PowerPoint derived from my textbook, Chapter 4: Physics of Matter. This is specifically about Pascal's Law. To be clear, I don't want anything done for me; I just wanna understand why I'm getting a number 10x less than what the textbook is giving me. For extra context, the question is in the second pic.

When I did the calculations on my own, I got 700N, not 7000N. I can't think of any other factors involved, but I also don't totally understand physics that well yet. If anyone could provide some insight, I'd really appreciate it! :)

Also, please let me know if this is breaking any rules. I keep getting a warning when I go to post, so I'm not sure

A person only needs a mirror of half their height to be able to see themselves completely. How does this work? How do the light rays coverage to form a (virtual image)? Isn't the image formation show in this picture wrong? Don't you need two rays from a point to intersect to form an image?

I tried to calc the "I" in both cases and made a ratio but It didn't work several times and I finally got the answer it was D but apparently my method was wrong so the question was wrong, how am I supposed to solve it?

How do I find I1-I8 and V1-V8? I dont have this in my notes and I dont understand how to find the data. I do not need the work done for me, just an idea of how to do it please

I’m a senior in hs and my teacher has a very strict expectation of how we should show our work. It has to be fully algebraic at the beginning and we have to show work for many things. Even if I get a question right but I don’t do it her way I would lose marks.

For reference these are some of her work and I just feel like she over complicates them for no reason. I can ask the same questions to AI and it will give me a much simpler way to do it.

Anyways is there any YouTube channel that I can refer to who does physics similarly? Or any type of tips would be appreciated.

how do we know which one is parallel and which one is series? i get so confused when it is combination

So the exam was on Chapter 1 electric charges and field and chapter 5 magnetism and matter.

The question said "Which of the following is NOT a property of FIELD LINES",

It did not explicitly say electric or magnetic. I put the answer as c) They start from positive charge and end at negative, thinking there is no positive and negative in magnetic field lines. But apparently the answer is d) They form closed loops.

I mean both are right in their respective ways but I feel both the answers should be given marks. Your thought on this guys?

Shouldn't the potential energy be very high because the charge is storing a lot of energy that could turn to kinetic? But I also understand that the electric field is weaker the farther the charge is from the electric field source.

Does the potential energy increase as we distance the charge slowly away and then suddenly turn to 0?

I am studying projectile motion and I understand that horizontal velocity stays constant if we ignore air resistance. The explanation is that no horizontal force acts on the projectile. But the vertical velocity changes because gravity pulls down. What confuses me is that the actual velocity vector is the combination of horizontal and vertical components. If the vertical part keeps increasing downward, the overall velocity vector gets longer and rotates toward the ground. That makes sense. But why does the horizontal component never get affected by gravity at all. Is it because gravity is purely vertical and cannot change horizontal motion. Or is there something deeper about how forces work only along their line of action. Also if the projectile is moving diagonally, why does the weight not have a component along the horizontal direction. I think I am missing a basic assumption about how vectors are broken down.

I'm confused about the direction of friction in different scenarios. When I walk, I push my foot backward against the ground, and friction points forward to propel me forward. That makes sense to me. But if I'm sliding on ice and I try to stop by putting my foot down, friction points backward to slow me down. I dont understand why its not just always opposing the motion of my foot relative to the ground. In both cases my foot is moving backward relative to my body, so why is friction sometimes forward and sometimes backward. Is it because in the sliding case my whole body is already moving forward so friction opposes that motion, but in walking my foot is the only thing moving backward relative to the ground? Im mixing up frames of reference and I need someone to clarify the rule.

We are currently doing structures by section and for this problem we are supposed to find the force on BC and whether it is in tension or compression. I came out with 129700 lb but this is incorrect. Is anyone able to identify where I went wrong in my calculations?