1. A runner moving at a speed of 8.8m/s rounds a bend with a radius of 25m. a. What is the centripetal acceleration of the runner?
b. What agent exerts the force on the runner?

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?