A referee runs towards you while blowing a whistle, resulting in a sound with a greater pitch than when you heard the whistle at halftime and the referee was stationary. What is this an example of

With i really need the correct answer!

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer

What is the increase in density of a medium due to wave travel?