What is the speed of a wave that has a frequency of 8,500 hz and a wavelength of 1.5 m?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

Convection currents are caused by differences in what two things?