Homework Statement
In the figure below the charge in the middle is Q = -4.6nC. For what charge q1 will charge q2 be in static equilibrium?
q1-----10cm------Q------10cm------q2
I know that the answer is supposed to be 18nC.
Homework Equations
F=Ke lq1llq2l/r2
The Attempt at a Solution...
Homework Statement
A cannon of mass 1500 kg fires a 10 kg shell with a velocity of 200 m/s at an angle of 45 degrees above the horizontal. Find the recoil velocity of the cannon across the level ground.
Homework Equations
Conservation of Momentum equation:
0=m1v1f + m2v2f
v1f = -...