1. The problem statement, all variables and given/known data A dart of inertia md is fired such that it strikes with speed vd, embedding its tip in the rim of a target that is a uniform disk of inertia mt and radius Rt. The target is initially rotating clockwise in the view shown in (Figure 1) , with rotational speed ω about an axis that runs through its center and is perpendicular to its plane. Assume that the dart's inertia is concentrated at its tip. What is the final rotational speed of the target if the dart strikes tangent to the target rim as in the figure, case (a)? Enter positive value if the rotation is counterclockwise and negative value if the rotation is clockwise. What is the final rotational speed of the target if the dart strikes normal to the rim as in the figure, case (b)? Enter positive value if the rotation is counterclockwise and negative value if the rotation is clockwise. 2. Relevant equations Really not too sure. But since there is mass and velocity I'm assuming energy equations? ΔK = (1/2)Iω^2 - (1/2)Iωi^2 where I = mr^2 3. The attempt at a solution So you end up with ω = (ω)^1/2 ? Is that correct? It doesn't seem right, any help would be great thanks.