![subject](/tpl/images/cats/fizika.png)
Physics, 11.07.2021 19:00 ewalker1917
A police car travels towards a stationary observer at a speed of 15m/s. the siren on the car emits a sound of frequency 250Hz. Calculate the observer frequency. the speed of sound is 340m/s​
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 10:50
Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 11:50
Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 16:00
The solid that is formed and usually sinks to the bottom of a solution is the
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 17:30
Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?
Answers: 2
You know the right answer?
A police car travels towards a stationary observer at a speed of 15m/s. the siren on the car emits a...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/fizika.png)
Physics, 16.11.2020 22:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/nemec.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/istoriya.png)
History, 16.11.2020 22:30
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/fizika.png)
Physics, 16.11.2020 22:30
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 16.11.2020 22:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 16.11.2020 22:30
![question](/tpl/images/cats/es.png)
Spanish, 16.11.2020 22:30