Q. A small piece of dust of mass m = 1.5 µg travels through an electric air cleaner in which the electric field is 600 N/C. The electric force on the dust particle is equal to the weight of the particle.
What is the charge on the dust particle?
Q. A jet is circling an airport control tower at a distance of 16.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 9.50x10-3 radians. Find the distance traveled (in meters) by the jet as the observer watches the nose of the jet cross from one side of the moon to the other.