Running on a treadmill is slightly easier than running outside because there is no drag force to work against. suppose a 60 kg runner completes a 5.0 km race in 16 minutes.

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

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?