Do EM Waves have to have a
medium?

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.