Students need to construct a device that sends a signal using both light and sound. They have a selection of items they can use to build the device. Which two items will be the most useful for making this signaling device?

State the right hand rule of the direction of magnetic field in a conductor carrying current

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.