Suppose a child swings around her straight arm about her shoulder joint at an angular velocity of 13 rad/s. If her arm is 40. 0 cm long, what is the speed of her hand?.

A child swings around her straight arm (it has 40 cm or 0.4 meter long) about her shoulder join at an angular velocity 13 rad/s. So, the speed of her hand is 5.2 m/s.The rotating movement of bodies is described by angular velocity. It measures how fast they travel around a fixed point.Unit of angular velocity is [tex]rad/s[/tex].To solve this problem, we could use formula as follows:V = R x ωwhere [tex]V[/tex] is linear velocity or speed in meter per second ([tex]m/s[/tex]), [tex]R[/tex] is radius of circle in meter, and ω is the angular velocity itself.The solution: V = R x ω = 0.4 m x 13 rad/s = 5.2 m/sTo know more about angular velocity, go to:brainly.com/question/12446100#SPJ4