Explain whether an object can have kinetic energy and potential energy at the same time

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

What are chlorofluorocarbons and what impact do they have on the atmosphere?