If you shout into the Grand Canyon, your voice travels at a speed of 340 m/s to the bottom of the canyon and back, and you hear an echo. How deep is the Grand Canyon at the spot where you hear an echo 5.2 seconds after?

Why does a balloon that is rubbed on someoneâs shirt stick to a wall at a party?

Consider a pair of forces, one having a magnitude of 20 n and the other a magnitude of 12 n. what is the strongest possible net force for these two forces? what is the weakest possible net force?

Which of these signals the beginning of fall

Which of the following is an example of good conflict management? O A. Letting an opponent's "trash-talking" break your focus. O B. Throwing a baseball bat down in anger. O C. Empathizing with other players. D. Yelling at other players.

Assume you have an ice cube and also a small rock that is the same size and shape as the ice cube. Predict what would happen if you placed the ice cube and rock in a glass of water.

Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m

A person suffering from anaemia gets tired

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?

Describe how electricity flows through a simple closed circuit.

Solar energy is produced by A. fusion of light nuclei to make heavier ones B. the slow release of heat left over from the Sun's formation C. fission of heavy nuclei into lighter ones D. solar magnetism