Streamline trains. forest grove, oregon, has a museum—a railroad museum—and with your admission ticket you get a free ride around their private track on either an old 1810 puffer or a streamliner of the 1950 era which was designed to speed at 160 km/h.
to measure the speed of the streamliner, we attach a pressure measuring device at the very front of the engine, at the stagnation point for the flowing air. we then measure the pressure when the train is moving and when it is standingstill. we find:
(i) on a nice sunny 25 oc day, we get a pressure reading of p=102,750 pa when the streamliner is not moving.
(ii) when the streamliner is traveling at its museum top speed along the straightaway, we find p =102,760 pa.
how fast is the train barreling along?