Ahorizontal vinyl record of mass 0.105 kg and radius 0.0757 m rotates freely about a vertical axis through its center with an angular speed of 5.80 rad/s and a rotational inertia of 5.18 x 10-4 kg·m2. putty of mass 0.0213 kg drops vertically onto the record from above and sticks to the edge of the record. what is the angular speed of the record immediately afterwards?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Idon’t quite understand this problem

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.