Astronauts often undergo special training in which they are subjected to extremely high centripetal accelerations. one device has a radius of 15 m and can accelerate a person at 98 m/s2. what is the speed of the astronaut in this device?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?