Lightning as a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 650 m to be the other plate. assume the surface area of the cloud to be the same as the area of a square that is 0.70 km on a side. a. what is the capacitance of this capacitor? b. how much charge can the cloud hold before the dielectric strength of the air is exceeded and a spark (lightning) results?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Why would an orange roll of your cafeteria tray if you stopped suddenly