AP Physics – Waves Ain’t Gone, Alas - 4
Thee Hee?________________________________________________________________________Per__

School days, I believe, are the unhappiest in the whole span of human existence. They are full of dull, unintelligible tasks, new and unpleasant ordinances, brutal violations of common sense and common decency. -- H.L. Mencken

1. A 7.50 kg ball is thrown. It has an initial velocity of 8.468 m/s. It travels a horizontal distance of 7.3 m in 1.25 s. Find: (a) The weight of the ball. (b) The initial kinetic energy of the ball. (c) The angle of the ball’s initial velocity with the horizontal.(73.5,74.9,46.4) 2. You are on a train traveling at 55.0 km/h. You approach a bell. The actual frequency of the bell is 725 Hz. What frequency do you hear? (759) 3. Draw a picture of a pendulum showing its swing. Label the following points: (a) point of maximum velocity, (b) point of minimum velocity, (c) point where the potential energy is greatest, (d) point where kinetic energy is greatest, (e) if the period of the pendulum is 0.750 seconds, what is its length? (f) What is the speed of the pendulum at the bottom of its swing if the angle that the thing makes at its maximum displacement is 11.0 ?(.14,.225)

4. A pipe is 18.5 cm long and open on one of its ends. (a) What are the frequencies of the first three harmonics that resonate in the pipe? (b) What is the wavelength of the third harmonic?(1st466 2nd 1300 3rd 2330, .148)

5. An FM radio station’s basic frequency has a wavelength of 2.67 m. What is its frequency?(1.12x108) 6. You have this really hot new car. It has one of the most outstanding sound systems available. Anyway it can like go faster than sound! So. When you are tooling down the test strip at Mach 2 (twice the speed of sound), could you hear the stereo? Explain the reasoning for your answer, whatever it is. 7. A frictionless