During a reversible cycle the working agent receives from the hot source an amount of heat equal to 150 Kj. The temperature of the hot source is equal to 225 K, and that of the cold one is 145 K. Determine the amount of heat transmitted to the cold source.

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?