Large electroscope is made with "leaves" that are 78-cm-long wires with tiny 43 g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 26∘ angle with the vertical , what total charge Q must have been applied to the electroscope?

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?