What is the wavelength of an earthquake wave if it has a speed of 12 km/s and a frequency of 15 hz

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

What are the dimensions of the cross section that passes through the points a, f, g, and d?