Acriminalist collects small strands of fabric from a crime scene. which type of evidence is he detecting?

latent evidence

trace evidence

direct evidence

gross evidence

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?