Which sphere of Earth do humans exist in? O atmosphere
O biosphere
O hydrosphere
O lithosphere

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

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

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow