Afootball player with a mass of 85 kg wears a uniform and helmet that have a mass of 4.5 kg. the football player moves at 2.1 m/s. what is the total momentum of the football player and uniform?

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

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving

Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?