A truck moving at 36 m/s is in the process of being passed by a police car moving at 45 m/s in the opposite direction. If the frequency of the siren relative to the police car is 500 Hz (stationary frequency), what is the frequency heard by an observer in the truck as the police car approaches the truck, just before passing

Ineed this now one scientist feels that the changes in global climatic patterns may be good for the health of the biosphere. another scientist feels that sharp changes in climatic patterns could result in the extinction of the biosphere. which of these is the most likely reason the two scientists gave conflicting opinions on the impact of changes in the global climatic pattern? they do not have enough knowledge on the topic. they did not discuss the issue among themselves. they believe conflicting opinion strengthens science. they study different areas of science and have different scientific focuses.