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Why doesn't the Normal reaction force on surface and the weight $mg$ add up?

I was learning about normal reaction force today and I saw a diagram like this: My questions about this are: Are $\mathbf {N_1}$ and $\mathbf {N_2}$ same in magnitude? Why don't $\mathbf{N_2}$ and ...
68 views

Why we don't see a spectrum of colours above water?

Why we don't see a spectrum of colours above water? When a light ray enters the water it will become dispersed, and after reflecting from an object in the water, say a pencil, or just the bottom of ...
25 views

Newton’s third law understanding [duplicate]

We have boxes and we are picking up a wood and put in between our hand and the box. We start pushing wood with 20N force. This force Is transferred from wood to the box and box return 20N to wood (...
31 views

Where does exactly this classical model of the hydrogen atom fail? [duplicate]

I know that classically, the hydrogen atom consists on an electrostatic interaction between the electron and the proton, with masses $m_e$ and $m_p$ respectively, with charge $e$. For the sake of ...
49 views

I am conducting an experiment in which I investigate the relationship between the counts per second detected by a Geiger Counter and the distance between said Geiger Counter and the source of ...
25 views