A rotating disk structure in the space has 80-meter diameter. The angular speed at its outer edge is 4 ( pie ) rad/s. (a) what is the period of the structure ? (b) what is the frequency of the structure?

In order to do work, the force vector must be question 1 options: in a different direction than the acceleration vector. in a different direction than the displacement vector. in the same direction as the displacement vector and the motion. in the same direction as the acceleration vector.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

You can melt ice by applying pressure because the solid/liquid line has a slope.