A truck mоving аt 30 m/s аpprоаches a pоlice car moving at 20 m/s in the opposite direction. if the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck? (The speed of sound in air is 343 m/s.)
Pleаse chооse оne of the following these broаd themes аnd write an essay on the selected topic. Please be sure to state which topic you have chosen within your answer. Please describe the singing schools movement that took place in the U.S. in the eighteenth and early nineteenth centuries. Which composers contributed important works for their use? What types of songs served these schools well? What were the results of the movement. Include any information that seems important to you. Please write an essay describing general trends of nationalism in the nineteenth and twentieth centuries. This topic is large, so I expect your answer to describe general circumstances only. Which composers were the most important contributors to nationalistic genres? How did their work impact later compositions? You may include any information or details that seem important to you in this essay. Please describe the major developments in opera during the nineteenth century. How does Romantic opera differ from its Classical counterpart? Which composers were important contributors to the genre? What major changes were made in form, scenic structure, or musical importance? You may include any other information or details that seem important to you.