On a particularly foggy night, a boat travels due east at 10 m/s. there are safety lights, but with the low visibility, the captain opts to sound the horn for 3 seconds every 5 seconds. the captain hears a beat frequency on the third blast he watches his compass and turns hard port maintaining the turn. when he no longer hears the beat, he straightens out his heading.
1. what caused the beat frequency?
2. why did turning stop the beat?
3. what was the frequency of the beat assuming lsound = 350 m/s?

Learning goal: to understand newton's 1st law. newton's principia states this first law of motion: an object subject to no net force maintains its state of motion, either at rest or at constant speed in a right line. this law may be restated as follows: if the sum of all forces acting on an object is zero, then the acceleration of that object is zero. mathematically this is just a special case of the 2nd law of motion, f⃗ =ma⃗ , when f⃗ =0. when studying newtonian mechanics, it is best to remember the 1st law in two ways: if the net force (i.e., sum of all forces) acting on an object is zero, the object will keep moving with constant velocity (which may be zero). if an object is moving with constant velocity, that is, with zero acceleration, then the net force acting on that object must be zero. complete the following sentences to see if you can apply these ideas. part a if a car is moving to the left with constant velocity, one can conclude that