A 77 kg bike racer climbs a 1100 m long section of road that has a slope of 4.3o. By how much does his gravitational potential energy change during this climb

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Does anyone have the answers to online physics course plato course physics, semester a v3.0