The plastic rod is made of insulator (plastic), so it does not allow charges moving from one sphere to another. This means that all the electrons given to sphere A will remain on sphere A.
The number of electrons initially given to sphere A is

, and since the charge of 1 electron is

, the net charge left on sphere A after the removal of the rod will be
Answer:
Explanation:
Given
speed of plane 150 mph
heading 
wind is blowing at 20 mph from south-east
velocity of plane w.r.t. wind






(b)after 30 minutes
Plane traveled in x direction 
Plane in Y direction 
Total distance
direction 
w.r.t east
Answer:
a = v²/R = 10²/6 = 16.7 m/s²
F = mv²/R = 2(16.7) = 33.3 N
Explanation:
Conservation of momentum requires that the sum of momenta after is equal to that before. Since initially nothing is moving, the sum after the shot will also add to zero.
m₁v₁ = -m₂v₂
Solve for the cannon's velocity v₁
v₁ = -m₂v₂/m₁ = -2.10m/s
The negative sign means it's moving 2.10m/s south.