1 chất điểm dạo động đều hoa theo pt x=Acos(πt+2π/3) chất điểm đi qua vị trí có li độ bằng a/2 lần thứ 2 kể từ lúc bắt đầu dạo động vào thời điểm nào

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?

What is special about a dc circuit ?

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