. A uniform electric field of magnitude 640 N/C exists between two parallel plates that are 4.00 cm apart. A proton is released from rest at the positive plate at the same instant an electron is released from rest at the negative plate. (a) Determine the distance from the positive plate at which the two pass each other. Ignore the electrical attraction between the proton and electron. (b) What If? Repeat part (a) for a sodium ion (Na1) and a chloride ion (Cl2)

Distance is 2.67cm

Explanation:

a)

F = q E = 1.6e-19 * 640 = 1.024e-16 N

ap = F/mp = 1.024e-16/1.673e-27 = 6.1207e10 m/s2

ae = F/me = 1.024e-16/9.109e-31 = 1.12416e14 m/s2

xp = 0.5 ap t2 = 0.5 * 6.1207e10 * t2 = 3.0604e10 t2

xe = o.5 ae t2 = 0.5 * 1.12416e14 * t2 = 0.56208e14 t2

xp + xe = 4.4 cm = 4.4e-2 m

3.0604e10 t2 + 0.56208e14 t2 = 4.4e-2

5.6239e14 t2 = 4.4e-2

t = 8.8452e-9 s

xp = 0.5 ap t2 = 0.5 * 6.1207e10 * (8.8452e-9*8.8452e-9) = 2.39 μm

b)

mp = m_Na = 22.9898 u = 22.9898*1.6605e-27 = 3.8175e-26 kg

me = m_Cl = 35.453 u = 35.453*1.6605e-27 = 5.8870e-26 kg

F = q E = 1.6e-19 * 640 = 1.024e-16 N

ap = F/mp = 1.024e-16/3.8175e-26 = 2.6824e9 m/s2

ae = F/me = 1.024e-16/5.8870e-26 = 1.7394e9 m/s2

xp = 0.5 ap t2 = 0.5 * 2.6824e9 * t2 = 1.3412e9 t2

xe = o.5 ae t2 = 0.5 * 1.7394e9 * t2 = 0.8697e9 t2

xp + xe = 4.4 cm = 4.4e-2 m

1.3412e9 t2 + 0.8697e9 t2 = 4.4e-2

2.2109e9 t2 = 4.4e-2

t = 4.4611e-6 s

xp = 0.5 ap t2 = 0.5 * 2.6824e9 * (4.4611e-6*4.4611e-6) = 2.67 cm

the pull of gravity on the rocket decreases

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