Astudent drops a rock from the top of a cliff such that rock falls downward toward earths surface in the absence of air resistance. the downward direction is considered to be the positive direction. the graph shows the rock’s velocity as a function of time. which of the following methods should be used to determine the total distance traveled by the rock after 4 s?

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

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

Which accurately compares concave and convex lenses?