A fire truck is moving away from a stationary observer at 15 m/s and has a siren frequency of 650 Hz. The speed of sound is 343 m/s. What is the frequency of the fire truck heard by the observer as the truck leaves?

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

What determines the amount of inertia an object has