a planet travels 200 km North, then 250 km South and turns east 50km East. If it takes 1.5 hours to reach its destination, find the plane's average velocity in m/s.

Which two particles are found in the center of an atom

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?