QUESTION

# A playground ride consists of a disk of mass M = 46 kg and radius R = 2.2 m mounted on a low-friction axle. A child of mass m = 20 kg runs at speed v...

A playground ride consists of a disk of mass M = 46 kg and radius R = 2.2 m mounted on a low-friction axle. A child of mass m = 20 kg runs at speed v = 2.8 m/s on a line tangential to the disk and jumps onto the outer edge of the disk.1. magnitude of the angular momentum of the child before collision: Lc = 123.22. angular momentum of the system of child plus the disk justafter the collision:Lc = 123.23. How fast is it rotating (initially at rest):w = 0.592 radians/s4. Speed of the child just after collision:v = 1.30245. Speed of the center of mass:vcm = 06. Magnitude of the linear momentum of the disk after the collision:|p| = 0I can't solve this problem:The child on the disk walks inward on the disk and ends up standing at a new location a distance R/2 = 1.1 m from the axle. Now what is the angular speed? (It helps to do this analysis algebraically and plug in numbers at the end.)w = ____ radians/sI used I(i)w(i) = I(f)w(f)The child on the disk walks inward on the disk and ends up standing at a new location a distance R/2 = 1.1 m from the axle. Now what is the angular speed? (It helps to do this analysis algebraically and plug in numbers at the end.)w = _____ radians/s