Q. A 10.0 g of Styrofoam carries a net charge of -0.700 uC and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet.
Q. A Cessna aircraft has a lift off speed of 120 km/h. What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 250 m?