What’s the next number in this sequence? 3,3,5,4,4,3,5,5,4,3,6

Take me out of a window, and I leave a grieving wife. But stick me in a door, and I can save somebody's life. What am I?

I'm a crude word for a BM, often associated with a single large piece, and sorry for any unwanted visuals. I'm also a three letter mathematical term, sometimes annoying, defining an exponent in multiplication. I'm a piece of tree, so please solve the word; an easy three letter term.

I’m a grandfather without children Crazy without a brain Loud without a mouth I’m in your pocket, on your arm, in your devices and in your yard Hurry up and guess already

A dance, plus a rotating blade A unreal villian with no victim I make the pieces of the puzzle So the whole can be made