A sound recording is made of a train as it blows its whistle for 10 seconds. The pitch of the sound appears to be decreasing during the 10 seconds. What conclusion, if any, could be made about the motion of the train and how do you justify this conclusion?

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.