X-rays used by dentists have a wavelength of roughly 3.0 x 10-4 m. What is the frequency of these waves?

What is work? how much work is done to move an object 0 meters?

Aregular polygon has angkes of size 150° each. how many side has the polygon

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.