1 chất điểm dạo động đều hoa theo pt x=Acos(πt+2π/3) chất điểm đi qua vị trí có li độ bằng a/2 lần thứ 2 kể từ lúc bắt đầu dạo động vào thời điểm nào

Rosa records the distance that a toy car rolls and the time it takes to cover the distance. what scientific practice is this? collecting data asking a question providing explanations communicating results

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

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.