![subject](/tpl/images/cats/fizika.png)
Physics, 06.08.2021 16:30 netflixacc0107
A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 0.90 s apart. The speed of sound in air is 343 m/s, and in concrete is 3000 m/s. How far away did the impact occur?
Speed of Sound in Various Materials(20°C and 1 atm)
Material Speed (m s)
Air 343
Air (0°C) 331
Helium 1005
Hydrogen 1300
Water 1440
Sea water 1560
Iron and steel ≈ 3000
Glass ≈ 4000
Aluminum ≈ 5100
Hardwood ≈ 4500
Concrete ≈ 5000
![ansver](/tpl/images/cats/User.png)
Answers: 3
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 02:30
Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic
Answers: 1
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 09:30
Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 11:40
Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 23.06.2019 01:00
What is the role of the water cycle in maintaining freshwater levels in lake and rivers?
Answers: 1
You know the right answer?
A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later...
Questions
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 23.07.2021 20:10
![question](/tpl/images/cats/en.png)
English, 23.07.2021 20:10
![question](/tpl/images/cats/biologiya.png)
Biology, 23.07.2021 20:10
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/health.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 23.07.2021 20:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 23.07.2021 20:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/fizika.png)
Physics, 23.07.2021 20:10
![question](/tpl/images/cats/istoriya.png)
History, 23.07.2021 20:10
![question](/tpl/images/cats/biologiya.png)
Biology, 23.07.2021 20:10
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/es.png)