Aring (2 kg, r = 2 m) rotates in a cw direction with initial angular velocity 10 s-1. a disk (8 kg, r = 2 m) rotates in a ccw direction with initial angular velocity 50 s-1. the ring and disk "collide" and eventually rotate together. assume that positive angular momentum and angular velocity values correspond to rotation in the ccw direction. what is the initial angular momentum li of the ring+disk system? what is the final angular velocity ωf of the ring+disk system?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).