When frictional force increases, mechanical advantage decreases why??​

Write the correct abbreviation for each metric unit

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Suppose that f : rn → rm and that a ∈ k, where k is a connected subset of rn . suppose further that for each x ∈ k there exists a δx > 0 such that f(x) = f(y) for all y ∈ bδx (x). prove that f is constant on k; that is, f(x) = f(a) for all x ∈ k