If an observer is hearing a rise in pitch that means the frequency of the waves in their position are falling

Aballet student who learns with the of his instructor is demonstrating learning.

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?