Recent content by liroj

Thanx. I know it's wavelength but was typing on my mobile phone. Is there a theoretical limit to the value of the wavelength? "A quantum of it"... the energy a photon can absorb, which is quantized, should relate to it, but my math skills are not that great... :) PS What is the current limit...

How precise can a wavelength of photons be measured and how much can it vary? For example, 300nm, 300.1nm, 300,11nm, 300.111 etc... What is the limit up to which we can measure it or is there a point where there is no variation anymore - something like a "quantum" of wavelength? Hope you...

You're missing the point. It's not the absoulte result (actual speed or duration of fall) I'm after. It's the relative speed of one body compared with the other. Not even the exact ratio is important. The point is that all things being equal, heavier ball falls faster. Cross sectional area is...

Since I'm no good at math, I used the online calculators and did some calculated "experiments". https://www.omnicalculator.com/physics/free-fall-air-resistance https://keisan.casio.com/exec/system/1224830797 For example, A body with mass of 1kg, air resistance of 0,24kg/m, falling from 56m...

Thanx!

So how do you explain his experiment?

I'm not skilled enough for the math needed here, sorry. One more question - how does this fact that heavier objects do fall faster in air relate to the Galileo tower of Pisa (most likely thought) experiment... how did he come to his conclusion based on that - the heavier object should have...

But I'm not sure that air vs lead is a fair example because buoyancy takes over with small densities. I believe we should ignore buoyancy here...

Increasing drag because of increasing speed doesn't decrease speed of falling in the air. It decreases acceleration and that means it decreases THE INCREASE of speed until terminal velocity is reached. At no point does the speed (and therefore the drag) decrease.

Acceleration drops as objects keep falling in the air. It reaches zero at terminal velocity. Force of gravity is the same for the duration of the fall (if we simplify it, although it increases slightly as the object is closer to the Earth) and depends on the mass of the object. Drag depends on...

I understand that part but what puzzles me is the acceleration of both balls until the lighter one reaches it's terminal velocity. Will their speed be the same at that point or will the heavier ball accelerate faster the whole time?

Two objects of the same shape (say balls) fall through the Earth's atmosphere. For simplification, let's say that the air density is the same (some average sea level value) despite altitude change. One ball has considerably bigger mass than the other, but besides that, they're the same. Will...

I found this, which I think proves my point, but I cannot say i really understand all the math behind it. https://imgur.com/a/gasXl http://www.princeton.edu/~akosmrlj/MAE545_S2017/lecture13-14_slides.pdf

Forget cell's input - let's keep it as simple as possible. Imagine that instead of a real cell we have a phospholipide bilayer - liposome, impermeable to solutes. When does osmosis stop in a SLIGHTLY hypotonic solutions. Do the concentrations match equally or osmotic pressure matches pressure...

I have a question about osmosis that goes a bit deeper than most basic textbooks so I cannot find the answer.Here's the problem: Imagine an animal cell, say a red blood cell, in a slightly hypotonic solution. The water starts to flow in osmotically. The concentration of solute in the cell...