What is a longitudinal wave?
a. particles that travel in parallel to the direction of energy movement
b. particles that travel in a reverse direction to the direction of energy movement
c. particles that travel perpendicular to the direction of energy movement
d. particles that travel in an intersecting direction to the direction of energy movement

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.