A roller coaster has a mass of 500 kg it drops from rest at the top of a hill that’s 57 m tall how fast is it going when it reaches the bottom acceleration due to gravity is g=9.8 m/s

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.

The amount of potential energy possessed by an elevated object is equal to what?

Which statement best describes the direction of the buoyant force on any object? a. opposite the force of gravity b. in the same direction as the weight c. in the direction of motion of the object d. opposite the direction of motion of the object