Question

135° Figure skater Michelle Kwan performs a triple jump. She rotates around her longitudinal axis three times while in the air. The time it takes to complete the jump from takeoff to landing is 0.6 sec. What was her average angular speed for this jump? Express your answer in degrees and radians. (2 pts) Dbao g ni) vloolo l d A discus thrower begins a throwing motion by spinning at an angular velocity of 3.5rad/s. The discus thrower's angular velocity is 27.5 rad/s at the point of release. The time from the beginning of the throw to the point of release is 0.85 sec, and the length from center of body and hand (i.e. radius of rotation) is 0.75 m. a. What is the average angular acceleration? Express you answer in degrees and radians. (2 pts) What is the linear tangential velocity at the point of release? (2 pts) b. What is the radial acceleration at the instant prior to the point of release? (2 pts) c.

Answer 1

- wo = 3.5 rad(Ace wf = 27.5 rad/sec see t = 0.85 r =0.75 @ wring wg = wot at x= wowo = 27.5-3.5 0.85 = 28.24 rad /sec2 1x=28.24 radac 5 = yw = 0.758 27.5 = 20:43 mi = 20.63 mlree 0.75 ay = 567. 19 m/s²