What happens when velocity and acceleration are not in the same direction?

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.