Arock falls off a cliff. how fast is the rock traveling vertically two seconds later?

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?