A toy parachute is dropped from on open window that is 13.0m above the round. If the parachute travels 9.0m horizontally, what is the resultant displacement and direction?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

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.

What energy transformations occur each time the skateboarder rolls up the ramp?