Q. An airplane flies 147 mi/hr with respect to the air. The air is moving 49 mi/hr with respect from the ground. If it moves 45 degrees east of north, what is the velocity of plane with respect to the ground?
Q. A nonconducting sphere has radius R = 2.53 cm and uniformly distributed charge q = +6.00 fC. Take the electric potential at the sphere's center to be V0 = 0.
What is V at radial distance r = 1.45 cm?