![subject](/tpl/images/cats/fizika.png)
Physics, 05.05.2020 23:46 Redeyestudio53
Beats: A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s?
![ansver](/tpl/images/cats/User.png)
Answers: 1
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 21.06.2019 19:20
How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.
Answers: 1
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 00:20
Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.
Answers: 2
![question](/tpl/images/cats/fizika.png)
You know the right answer?
Beats: A policeman in a stationary car measures the speed of approaching cars by means of an ultraso...
Questions
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/pravo.png)
Law, 16.12.2020 01:00
![question](/tpl/images/cats/en.png)
English, 16.12.2020 01:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 16.12.2020 01:00
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 16.12.2020 01:00
![question](/tpl/images/cats/mat.png)
Mathematics, 16.12.2020 01:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/health.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/en.png)
English, 16.12.2020 01:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 16.12.2020 01:00
![question](/tpl/images/cats/en.png)
English, 16.12.2020 01:00
![question](/tpl/images/cats/en.png)
English, 16.12.2020 01:00