Ananya Reddy11thSample· 1mo ago
Damped and forced oscillations: does amplitude really go infinite at resonance, and which frequency does the system oscillate at?
I made a colour-coded summary but the resonance part doesn't add up.
#physics
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- Sara Fernandes11thSample· 1mo ago
Same liquid height in three differently shaped vessels gives same pressure at the bottom, but the weight is different. Where does the force come from?
Back from football practice and my brain is still stuck on this. Take three vessels with the same base area, one a narrow straight tube, one a wide jar, one a conical flask with the base the same size. Fill all with the
- Meera Patel11thSample· 1mo ago
Zeroth law feels obvious, so what does it actually let us define? And are heat and work state variables?
I have been revising Thermodynamics, and the Zeroth law of thermodynamics looks too obvious to be called a law. NCERT states it as: two systems in thermal equilibrium with a third system separately are in thermal equilib
- Ananya Reddy11thSample· 1mo ago
NCERT says steel is more elastic than rubber, but rubber stretches so much and returns. What am I missing?
I'm colour-coding the Mechanical Properties of Solids chapter and I hit a statement I can't reconcile: "steel is more elastic than rubber". But rubber stretches a lot and comes back, while steel hardly stretches at all.
- Ananya Reddy11thSample· 1mo ago
Vernier zero error sign confusion + is parallax angle for a star the full shift or half?
Two small things from the measurement section that keep tripping me in my colour-coded notes I have a whole pink page for "zero error" and it still isn't clear . 1. Vernier calipers. Main scale smallest division is 1 mm
- Aarav Kulkarni11thSample· 1mo ago
Centre of mass of semicircular ring vs disc vs hemispheres, which number belongs to which? And explosion in mid-air?
My checklist for System of Particles now has a "centre of mass positions" table, and I mixed up the entries. I need someone to help me check it and explain why the numbers differ. Distances from the centre of the flat fa
- Sara Fernandes11thSample· 1mo ago
Periodic vs oscillatory vs SHM: which of these functions is actually simple harmonic?
Between football practice and homework I just did a worksheet on Oscillations and got most of the 'which of these represent SHM' questions wrong, so I think I'm missing something simple. The ones I got confused on: 1. x
- Diya Menon11thSample· 1mo ago
Why 2S/r for a drop but 4S/r for a soap bubble, and which way does mercury go in a capillary?
omg I love this chapter and I hate it. 😭 Excess pressure inside a liquid drop is \dfrac{2S}{r} and inside a soap bubble it's \dfrac{4S}{r} . Our teacher says the soap bubble has "two surfaces". But my brain says a bubble
- Diya Menon11thSample· 1mo ago
Current has a direction but is called a scalar. Which quantities are really vectors, then?
Ahh I need help with a silly doubt that is not so silly. Motion in a Plane, scalars and vectors. NCERT says a vector has magnitude and direction. But current also has a direction we show the arrow in circuits! and yet it
- Aarav Kulkarni11thSample· 1mo ago
Kepler's laws: I can recite them, but can't use them. Is planetary speed constant? Which 'a' in T² ∝ a³?
I made a checklist for Gravitation and Kepler's laws is where my ticks stopped. Law 1: orbit is an ellipse with the Sun at one focus. Law 2: line joining the planet and the Sun sweeps equal areas in equal intervals of ti
- Kabir Joshi11thSample· 2mo ago
Stefan's law with Celsius temperatures, Wien's displacement direction, and why the average-temperature trick works in Newton's cooling
Three doubts from the same chapter and my notes are inconsistent. 1. A body at 27°C is heated to 327°C. By what factor does the power it radiates Stefan's law increase? I did 327/27 ^4 \approx 21{,}000 and it's nowhere i
- Aarav Kulkarni11thSample· 2mo ago
Radian is a unit but not a base unit, and mole is "just a number" but is one. Why?
Started the Units and Measurements chapter and, being me, I made a checklist. NCERT says there are 7 base quantities in SI: length, mass, time, electric current, thermodynamic temperature, amount of substance and luminou
