Answer:
![A=1.4598 cm^2](https://tex.z-dn.net/?f=A%3D1.4598%20cm%5E2)
Explanation:
The cross sectional area of the hole can be find using
Δ![A=2*\alpha *A_0*T'](https://tex.z-dn.net/?f=A%3D2%2A%5Calpha%20%2AA_0%2AT%27)
![A-A_0=2*\alpha*A_0*T'](https://tex.z-dn.net/?f=A-A_0%3D2%2A%5Calpha%2AA_0%2AT%27)
![A=A_0*(2*\alpha*T'+1)](https://tex.z-dn.net/?f=A%3DA_0%2A%282%2A%5Calpha%2AT%27%2B1%29)
![T'=156-24.2=131.8C](https://tex.z-dn.net/?f=T%27%3D156-24.2%3D131.8C)
![A_0=\pi *r^2](https://tex.z-dn.net/?f=A_0%3D%5Cpi%20%2Ar%5E2)
![A_0=\pi *0.68cm^2=1.452 cm^2](https://tex.z-dn.net/?f=A_0%3D%5Cpi%20%2A0.68cm%5E2%3D1.452%20cm%5E2)
Steel coefficient ![\alpha=1.2x10^{-5}C^{-1}](https://tex.z-dn.net/?f=%5Calpha%3D1.2x10%5E%7B-5%7DC%5E%7B-1%7D)
replacing to find A
![A=1.4552cm^2*(2*1.2x10^{-5}C^{-1}*131.8C+1)](https://tex.z-dn.net/?f=A%3D1.4552cm%5E2%2A%282%2A1.2x10%5E%7B-5%7DC%5E%7B-1%7D%2A131.8C%2B1%29)
![A=1.4598 cm^2](https://tex.z-dn.net/?f=A%3D1.4598%20cm%5E2)
Answer:
Acceleration, ![a=3.6\times 10^{16}\ m/s^2](https://tex.z-dn.net/?f=a%3D3.6%5Ctimes%2010%5E%7B16%7D%5C%20m%2Fs%5E2)
Explanation:
It is given that, two isolated protons are separated by 2 nm. The force due to charged particles is given by :
![F_e=\dfrac{kq^2}{d^2}](https://tex.z-dn.net/?f=F_e%3D%5Cdfrac%7Bkq%5E2%7D%7Bd%5E2%7D)
Force due to mass of proton, ![F_g=ma](https://tex.z-dn.net/?f=F_g%3Dma)
![ma=\dfrac{kq^2}{d^2}](https://tex.z-dn.net/?f=ma%3D%5Cdfrac%7Bkq%5E2%7D%7Bd%5E2%7D)
![a=\dfrac{kq^2}{md^2}](https://tex.z-dn.net/?f=a%3D%5Cdfrac%7Bkq%5E2%7D%7Bmd%5E2%7D)
![a=\dfrac{9\times 10^9\times (1.6\times 10^{-19})^2}{1.6\times 10^{-27}\times (2\times 10^{-9})^2}](https://tex.z-dn.net/?f=a%3D%5Cdfrac%7B9%5Ctimes%2010%5E9%5Ctimes%20%281.6%5Ctimes%2010%5E%7B-19%7D%29%5E2%7D%7B1.6%5Ctimes%2010%5E%7B-27%7D%5Ctimes%20%282%5Ctimes%2010%5E%7B-9%7D%29%5E2%7D)
![a=3.6\times 10^{16}\ m/s^2](https://tex.z-dn.net/?f=a%3D3.6%5Ctimes%2010%5E%7B16%7D%5C%20m%2Fs%5E2)
So, the acceleration of two isolated protons is
. Hence, this is the required solution.
One meter is about three feet, so I would say C
Radiation because it radiates the heat in there body therefore making them hot.