Shown below are three time histories for the free response of a single-DOF system with zero initial stretch in the spring and an initial velocity downward. These time histories correspond to damping ...

In this paper, we present some criteria for the oscillation of the differential equation with damping (γ(t)x'(t))' + p(t)x'(t) + q(t)x(t) = 0, t ∈ [ t0, ∞), where p(t) and q(t) are allowed to change ...

Electricity is traditionally sent along power lines and into homes at 60 Hz, but this isn’t quite true. After traveling long distances, the standard frequency of 60 Hz increases on one side of ...