A 2.75 kg mass is pressed against a horizontal spring (k = 325 N/m) on a friction less surface. If the block is pulled 6.5 cm from its equilibrium position and then released, What is the speed of the block when its released?

Anybody wanna ? (picture included? )

Ms.hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions