O potássio-40 e um dos principais isótopos radioactivas do corpo humano e seu decaimento pôde formar cálcio-40 com a emissão de energia e de partículas radioactivas. No decaimento de k⁴º, produzido Ca⁴º, a particula emitida denomina-se: (dados: número atómico k = 19 e Ca = 20)?

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

i think it's 35 meters

answer///terminator or twilight zone;