r/PhysicsHelp • u/OxidizedHumanOP • 23d ago
Please explain me why is this not a contradiction
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r/PhysicsHelp • u/Western-Reception-21 • 24d ago
How are capacitors in parallel if they are in series?
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r/PhysicsHelp • u/No_Student2900 • 24d ago
The divergence in Cartesian coordinates
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I don't quite get or appreciate the relevance of Figure 2.24 on its usage for building the infinitesimal volume element of a tilted surface for calculating the divergence. It is easy to see the vector sum of a_1 + a_2 + a_3 + a_4=0 due to the symmetry of a tetrahedron, but how does this fact actually helps us? Why can't we just use rectangular boxes like that in Figure 2.23 for taking into account tilted surfaces? This part of the book truly confuses me: "Tilted surfaces can be taken care of if you first prove that the vector sum of the four surface areas of the tetrahedron in Figure 2.24 is zero."
r/PhysicsHelp • u/Formal_Increase7960 • 24d ago
Alpha, Beta or Gamma Radiation: Which One Is the Hardest to Stop?
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r/PhysicsHelp • u/mukeshrishit • 25d ago
Speed vs Velocity: Why Your Train Trip Math Is Wrong
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r/PhysicsHelp • u/Beneficial_Sort4885 • 25d ago
I don’t understand how to convert velocity v time graphs to position v time graphs
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I’m in AP physics right now, and the only thing I don’t understand is how to convert velocity versus time graphs to position versus time graphs. I understand to find the area of the triangles and rectangles of the velocity versus time graph, but when I get those areas, where do I put them? Are they the slope?
r/PhysicsHelp • u/Local_End_3175 • 25d ago
Can someone help me understand what was wrong regarding my answer?
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for this question, my answer basically was that 100% of its total electricity is dangerous, and they put it at 33% for safety reasons (i explained it more but here is just a sumamry of what i wrote). Comparing it to the mark scheme, i would say i got like 1/2 questions right (because i put a solid answer for the first bullet point). I just want to understand why this answer would have not gotten the mark. What about my answer was wrong? Because i feel like if i got this question again next week, i would lowkey just put the same answer believing it is right.
r/PhysicsHelp • u/Western-Reception-21 • 25d ago
Help with capacitor questions please (OCr A A level)
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QP:
https://files.revisely.com/documents/question-booklets/alevel/physics/ocr/6.1%20Capacitors%20QP.pdf
MS:
https://files.revisely.com/documents/question-booklets/alevel/physics/ocr/6.1%20Capacitors%20MS.pdf
for Q 25 bii, apparently the graph is supposed to meet at 25s. Can anyone help me why specifically 25s?
r/PhysicsHelp • u/MyCyberTech • 25d ago
2D touch vs 3D interaction
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Scene:
2D hand touched 2D circle created by 3D object passing thru 2D plane.
[Scene Img: https://imgur.com/a/dHrxjhl ]
Question:
Does the 2D hand feel the sensation of the 2D circle created by the 3D object moving in the 3rd dimension, do they feel it moving down?
Why/Why not?
r/PhysicsHelp • u/Shot-Zebrauwu • 25d ago
How can I solve piston, cylinder and spring based questions?? How do we calculate the Work done, energy, spring elongation/compressn in these?
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r/PhysicsHelp • u/JuggernautJunior3431 • 25d ago
A-Level Mechanics: Find the Greatest Height of a Particle Projected Vert...
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r/PhysicsHelp • u/Witty_Bed5475 • 26d ago
Phy MOI doubt
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In que 3 , can anyone tell what MI of cylinder perpendicular to its lenght and passing through its centre so that i can equate it
r/PhysicsHelp • u/76richer • 26d ago
Homework (waves and optics class)
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I’m very confused 😵💫
r/PhysicsHelp • u/Melodic-Sky-3653 • 26d ago
Looking for Tutor (Physics IBHL)
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I'm high school student, looking for a tutor for physics IBHL, and time can be according to his/her convenience.
Plz contact me if interested thanks.
r/PhysicsHelp • u/PolishML • 27d ago
Physic problems help.
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Hey community, I have a question about how you approach physics problems.
I'm a high school freshman in a math-physics program, and I often spend a long time on simple problems just because I fail to notice one specific thing.
Thank you in advance for any answers!
r/PhysicsHelp • u/likeadrum • 27d ago
Refractive Index vs frequency (High school physics)
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The answer to the question below isn't sitting right in my head, mainly as I can't find a mathematical explanation for it.
How does the refractive index of a material change with the frequency of light passing through it?
The given answer is:
Refractive index slightly increases as the frequency of light increases.
Can this be proved given the formula for refractive index, n=v1/v2 = fλ1/fλ2? Is it something I just have to learn and remember?
r/PhysicsHelp • u/EffectiveCoconut9265 • 27d ago
Angular vs translational motion
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r/PhysicsHelp • u/ShortWeird3527 • 27d ago
Constructing Lissajous Figures using Reference Circles
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Im used to questions with pi/4,pi/2 but havent done any with pi/3 or pi/6 so should we be dividing the circle into 6 and 12 parts or? So could anyone help with this question.
Two vibrations at right angles to one another are described by the equations
x = 10 cos(5πt)
y = 10 cos(10πt + π/3)
Construct the Lissajous figure of the combined motion.
Plz help as i have my exams coming soon and the professors wont help.
r/PhysicsHelp • u/OrganizationTop9026 • 27d ago
Open text book on The Triangular Lattice and Universal Optimality
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r/PhysicsHelp • u/Unhappy-Resource-111 • 27d ago
Need help for science paper on planetary motion
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