Answer:
sound Requires a medium in order to travel.
Answer:
If you haven’t read about the shark found swimming in and out of a segment of an undersea volcano, then you really need to get up to date.
Explanation:
Answer:
10573375000
![216.57162\ N/C](https://tex.z-dn.net/?f=216.57162%5C%20N%2FC)
Explanation:
k = Coulomb constant = ![8.99\times 10^{9}\ Nm^2/C^2](https://tex.z-dn.net/?f=8.99%5Ctimes%2010%5E%7B9%7D%5C%20Nm%5E2%2FC%5E2)
r = Distance = ![\dfrac{d}{2}=\dfrac{23}{2}=11.5\ cm](https://tex.z-dn.net/?f=%5Cdfrac%7Bd%7D%7B2%7D%3D%5Cdfrac%7B23%7D%7B2%7D%3D11.5%5C%20cm)
E = Electric field = 1150 N/C
Electric field is given by
![E=\dfrac{kq}{r^2}\\\Rightarrow q=\dfrac{Er^2}{k}\\\Rightarrow q=\dfrac{1150\times 0.115^2}{8.99\times 10^9}\\\Rightarrow q=1.69174\times 10^{-9}\ C](https://tex.z-dn.net/?f=E%3D%5Cdfrac%7Bkq%7D%7Br%5E2%7D%5C%5C%5CRightarrow%20q%3D%5Cdfrac%7BEr%5E2%7D%7Bk%7D%5C%5C%5CRightarrow%20q%3D%5Cdfrac%7B1150%5Ctimes%200.115%5E2%7D%7B8.99%5Ctimes%2010%5E9%7D%5C%5C%5CRightarrow%20q%3D1.69174%5Ctimes%2010%5E%7B-9%7D%5C%20C)
Number of electrons is given by
![n=\dfrac{1.69174\times 10^{-9}}{1.6\times 10^{-19}}\\\Rightarrow n=10573375000](https://tex.z-dn.net/?f=n%3D%5Cdfrac%7B1.69174%5Ctimes%2010%5E%7B-9%7D%7D%7B1.6%5Ctimes%2010%5E%7B-19%7D%7D%5C%5C%5CRightarrow%20n%3D10573375000)
Number of excess electrons is 10573375000
r = 0.115+0.15 = 0.265 m
![E=\dfrac{kq}{r^2}\\\Rightarrow E=\dfrac{8.99\times 10^9\times 1.69174\times 10^{-9}}{0.265^2}\\\Rightarrow E=216.57162\ N/C](https://tex.z-dn.net/?f=E%3D%5Cdfrac%7Bkq%7D%7Br%5E2%7D%5C%5C%5CRightarrow%20E%3D%5Cdfrac%7B8.99%5Ctimes%2010%5E9%5Ctimes%201.69174%5Ctimes%2010%5E%7B-9%7D%7D%7B0.265%5E2%7D%5C%5C%5CRightarrow%20E%3D216.57162%5C%20N%2FC)
The electric field is ![216.57162\ N/C](https://tex.z-dn.net/?f=216.57162%5C%20N%2FC)
C.
The train first sped up, giving it a positive acceleration in the beginning. This eliminates D since that choice states that it begins with a negative acceleration. This also eliminates B since that choice states that the train only had a negation acceleration.
Next, the train slows down, giving it a negative acceleration. We’re looking for the answer choice that starts with a positive acceleration and ends with a negative one. This makes C the correct answer. Hope this helps!
Answer:
centripetal force is a net force that acts on an object to keep it moving along a circular path and elastic force acts to return a spring to its natural length