A yo-yo [see Fig (a)] is constructed from two identical uniform disks of radii R and mass M. They are held together by a massless cylindrical spindle of smaller radius R0. The yo-yo is wound with very thin, massless string. what is the speed of the center of mass of the yo-yo after descending a distance h

no. dot product   =0 when vecs at right angles

radiation

explanation:

heat is transmitted by radiation

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.