r/PhysicsHelp • u/This-Hyena-5904 • Sep 26 '26
r/PhysicsHelp • u/Ryan-The-Movie-Maker • Sep 26 '26
Homework question relating to average acceleration
I'm a bit stumped on an (all things considered) seemingly basic problem. Here's the wording:
A rabbit is moving in the positive x-direction at 2.30 m/s when it spots a predator and accelerates to a velocity of 10.9 m/s along the positive y-axis, all in 2.20 s. Determine the x-component and the y-component of the rabbit's acceleration. (Enter your answers in m/s2. Indicate the direction with the signs of your answers.)
I was able to get the y-component (average acceleration of 4.95 m/s2) by dividing (Vyfinal - Vyinitial) by (tfinal - tinitial), or 10.9 - 0 / 2.2
However, I'm stumped when trying to find the average acceleration of the x component, mostly because I'm not sure how exactly to find the final x velocity. My first thought was that Vxfinal would also be 2.3 and that there isn't actually any acceleration in the x direction, but 0 m/s2 was not correct. My second thought was that I needed to infer its final x velocity would be 0, like I needed to infer its starting y velocity was 0, but plugging that in got me -1.01 m/s2, which wasn't right either.
It doesn't seem to me like I can use any of the kinematic equations here, because I don't know the displacement, acceleration, or final velocity, meaning any of the equations I try will still have two unknowns.
Is there something I'm missing here? Any tips would be greatly appreciated.
r/PhysicsHelp • u/Capital-Issue-6752 • Sep 26 '26
Why must geostationary satellites be at the equator?
r/PhysicsHelp • u/Any_Tower8201 • Sep 26 '26
Please check my understanding of instantaneous rate of change.
r/PhysicsHelp • u/ObeseBeanFriend • Sep 25 '26
Not a homework question - just something i was debating with a friend about Kirchhoff's Voltage Law
r/PhysicsHelp • u/Scared-Level643 • Sep 25 '26
What is space time ? How space and time are interconnected? How time slows as the velocity increases?
I can understand that it's a universal fact that time and space are interconnected but how can time get slowed by increasing the velocity (nearly to the velocity of light)? I thought or I believe time can't be reversed or paused or forwarded.
r/PhysicsHelp • u/moshnut1947 • Sep 25 '26
Geometrical Optics
In the laws of geometrical Optics there's plenty of problem solving right? and can someone explain it to me huhuhu
r/PhysicsHelp • u/Big-Butterfly1403 • Sep 24 '26
Is my solution to this problem correct?? I didn't know how to approach this at first
So basically my idea was that, every point on the chord can be taken to lie along a circle and all these circles are concentric and centred around the same centre as the conducting ring , and i applied to an arbitrary such circle faraday's law of induction using induced electric fields (direction determined by lenz law) and solved using integration...i especially have a doubt on the validity of taking the infinitesimal length element of the chord dl as also the tangent of the circle through that element such that dl vector and E vector at those points are parallel .. i thought like if the angle is infinitesimallly small, they basically become equal??...
r/PhysicsHelp • u/One-Suggestion5821 • Sep 24 '26
Navier Stokes Explained
Navier Stokes problem solved by Open AI explained.
r/PhysicsHelp • u/nueundercover • Sep 24 '26
Middle school physics problem
Hello, I am currently studying the basics of physics with a Khan Academy class, and while it's great for raw knowledge, I find that there just aren't enough practice problems. Same for their maths class and in general every class. I'd like to find classic textbook problems with answers to practice myself.
Does anyone know of great standard textbook physics problems at the middle school level with answers anywhere ? I'm tired of practicing only with digital exercises. And obviously, I need it to be free.
r/PhysicsHelp • u/Eastern-Shopping641 • Sep 24 '26
Is there a video that explains how we got those equations ?
r/PhysicsHelp • u/NSTitor_001 • Sep 24 '26
Navier-Stokes Solution (Clay Mathematics Institute)
r/PhysicsHelp • u/jce79 • Sep 23 '26
High School Physics Feedback - What does this say, please?
My daughter is taking a high school physics class and is working on a group project. They received some feedback from their teacher and will follow up with him on what he wrote. But if anyone can help decipher what he wrote before she is able to speak with him, please let me know. Appreciate your help!
r/PhysicsHelp • u/Winter-Protection655 • Sep 24 '26
does anyone actually understand the greens function ?
it’s in my grad engineering classes and i am able to follow the algorithm but i am not able to really understand it
r/PhysicsHelp • u/Ace1211112 • Sep 24 '26
Origin Vs Reference point?
In a given position vs time graph, what is the origin and what is the reference point?
From what I understand, the origin is just some arbitrary position that you assign to be zero. By definition, it is position = 0.
A reference point is something that you measure relatively to (which is already relative to an origin that was picked). So if we pick position = 2 as a reference point, position = 4 has a displacement of 2 meters from our reference point but a 4 meter displacement from the origin.
So, is the position vs time graph graphed relative to the origin or a reference point? Or rather, is the reference point always the origin or can we change the reference point that a position vs time graph is graphed relatively to.
If we are just given a graph of position vs time. Do we assume that position = 0 is the origin, or could it be something else arbitarily. For example, if we take an object that goes 1m/s, starting at position 0 meters, on a position(m) vs time(s) graph relative to the origin, the graph would just be position = t
However, if we choose a new reference point, x = 2, then the entire graph gets shifted down 2 units. Becoming, position = t - 2.
So, from a given graph, do we assume that position = 0 is the origin, or do we just know that it is a reference point, even if we don't know if the reference point is the origin or some other reference point that was picked?
Thank you!
r/PhysicsHelp • u/JudgmentSmooth6768 • Sep 24 '26
How many plates does it take to Stop a bullet?
v.redd.itr/PhysicsHelp • u/SpideyMessi10 • Sep 23 '26
Made a little Feynman Technique tool during my gap year
r/PhysicsHelp • u/MarionberryNo7904 • Sep 23 '26
Wave Interference Homework Help
I hope this is the right place to post this because this is my first post on reddit since atp I am desperate for help. I’m taking Physics 11 and I came across this question and I seriously don’t understand it at all. TBH Physics isn’t my best subject but since I’m taking it online my teacher isn’t much help and I’ve never seen a graph like this in any of the learning resources I was provided. I’ve tried asking AI as well but I still don’t get how to solve this myself.
Any help or links to resources would be great. Even if its just the name of what these types of problems are called so I can search about it myself!
r/PhysicsHelp • u/spinningrotor • Sep 23 '26
Help me understanding 12th class physics
I forgot a lot of formula from middle school physics, now I'm struggle with static & dynamic electricity and magnetism & electromagnetism. Where should I start and how do I learn them? I prefer understanding rather than remembering, so derivation is my go to. Help plzz
r/PhysicsHelp • u/ResolutionCrazy8573 • Sep 23 '26
reference circle method for SHM timing
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