Answer:
For proton

For electron

Explanation:
We know that
The mass of electron

The mass of proton

Charge on electron and proton
q₁=q₂=q

Electrostatics force

Now by putting the values


For proton
F = m a
a =F/m


For electron


Answer:
20 ft
Explanation:
This is the length where the direct contact could be used as ground electrode
Answer:
The magnitude of the angular acceleration is 
Explanation:
From the question we are told that
The angular speed of CD is 
time taken to decelerate is 
The final angular speed is 
The angular acceleration is mathematically represented as

substituting values


The negative sign show that the CD is decelerating but the magnitude is

This is simply F=ma so 70N/30m/s^2 will give you the max mass which would be in kg, and the mass would be 2.333333kg a very light plane I might say