Answer:
9:02:05 am
Explanation:
The time the cars will travel is equal assuming they started and stopped at the same time
Distance = Speed × Time
![s_P=30t](https://tex.z-dn.net/?f=s_P%3D30t)
![s_Q=26t](https://tex.z-dn.net/?f=s_Q%3D26t)
Distance between them is 7 km
![30t+26t=7000\\\Rightarrow 56t=7000\\\Rightarrow t=\frac{7000}{56}\\\Rightarrow t=125\ s](https://tex.z-dn.net/?f=30t%2B26t%3D7000%5C%5C%5CRightarrow%2056t%3D7000%5C%5C%5CRightarrow%20t%3D%5Cfrac%7B7000%7D%7B56%7D%5C%5C%5CRightarrow%20t%3D125%5C%20s)
Time it takes them to meet is 125 seconds or 2 minutes and 5 seconds
So, the time will be 9:02:05 am
Answer:
![v_e=\sqrt{\frac{m_pv_p^2}{m_e}}](https://tex.z-dn.net/?f=v_e%3D%5Csqrt%7B%5Cfrac%7Bm_pv_p%5E2%7D%7Bm_e%7D%7D)
Explanation:
You can consider that the force that acts over the proton is the same to the force over the electron. This is because the electric force is given by:
![F=qE](https://tex.z-dn.net/?f=F%3DqE)
![F_p=F_e](https://tex.z-dn.net/?f=F_p%3DF_e)
where E is the constant electric field between the parallel plates, and is the same for both electron and proton. Also, the charge is the same.
by using the Newton second law for the proton, and by using kinematic equation for the calculation of the acceleration you can obtain:
![m_pa_p=qE\\\\a_p=\frac{v_p^2}{2d}\\\\\frac{m_pv_p^2}{2d}=qE](https://tex.z-dn.net/?f=m_pa_p%3DqE%5C%5C%5C%5Ca_p%3D%5Cfrac%7Bv_p%5E2%7D%7B2d%7D%5C%5C%5C%5C%5Cfrac%7Bm_pv_p%5E2%7D%7B2d%7D%3DqE)
(it has been used that vp^2 = v_o^2+2ad) where d is the separation of the plates, ap the acceleration of the proton, vp its velocity and mp its mass.
By doing the same for the electron you obtain:
![\frac{m_ev_e^2}{2d}=qE](https://tex.z-dn.net/?f=%5Cfrac%7Bm_ev_e%5E2%7D%7B2d%7D%3DqE)
we can equals these expressions for both proton and electron, because the forces qE are the same:
![\frac{m_pv_p^2}{2d}=\frac{m_ev_e^2}{2d}\\\\v_e=\sqrt{\frac{m_pv_p^2}{m_e}}](https://tex.z-dn.net/?f=%5Cfrac%7Bm_pv_p%5E2%7D%7B2d%7D%3D%5Cfrac%7Bm_ev_e%5E2%7D%7B2d%7D%5C%5C%5C%5Cv_e%3D%5Csqrt%7B%5Cfrac%7Bm_pv_p%5E2%7D%7Bm_e%7D%7D)
It loses it's fuel supply from the water and begins to weaken
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