Do you mean - to kill everybody, or - to make the Earth disintegrate? It also depends on how big the bombs are and where they are placed.
1
It would depend on the size of the bomb.
that would depend on yield and where they were detonated. but the answer is more than have ever been built or could be built.
Cannot be answered as there are too many variables, only one of which is the yield of the bombs used.
2 in war, probably thousands in testing.
To say how many nuclear bombs it would take to blow up the sun is almost impossible. Actually the sun is a continuously exploding thermonuclear bomb, that's where the energy comes from - fusion. It doesn't matter how many bombs you shot into the sun, it would just get hotter.
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All of them. Every bomb ever dropped hit the earth. Somewhere.
depends on how big the bombs are, if they were as big as Tsar Bomba (Soviet bomb 60MT) it would take about from 15-25 no you retard it would take about 15-25 to blow the usa NT the us it would take 10 a-bombs to kill every living thing (cuz of the radiation)
One. I mean like the charges that they use in 'Inception'
Nobody has ever had enough bombs to blow up the earth! The figure that there are enough nuclear weapons to kill everybody on the earth 10, 20, 50, or however many times over is an entirely different issue (and is very speculative). It may have been true in the middle 1980s at the peak of the arms race, but since START was signed total number of weapons have fallen continuously.
Anywhere from 1 to trillions, depending on:yieldburst height/depthburst slant rangeetc.