Apitcher is in 85° of abduction, holding a 1.4 n baseball at point c, 65 cm from the joint axis at point o • the center of gravity of his arm is 25 cm from the joint axis of shoulder abduction at point o • the weight of the arm w is 0.06 of the pitcher’s weight of 100 n • deltoids muscles are at an angle θ of 15° with respect to the humerus and insert 15 cm from the joint axis at point a • determine the force applied by the deltoid muscles and the joint reaction force at the shoulder joint and its orientation β

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?