An ostrich lays the largest bird egg. A typical diameter for an ostrich egg so its widest part is 12 cm. Suppose an egg of this size rolls down a slope
so that the centripetal acceleration of the shell at its widest part is 0.28
m/s. What is the tangential speed of that part of the shell?

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?