Aball attached to a string of 2m is raised to an angle of 38 degrees below the horizontal and then released. a) what is the expected velocity of the ball when it reaches the bottom of its swing, neglecting air resistance?
b) it was measured that the actual velocity was 3.0 m/s. what was the work done by air resistance if the mass of the ball is 0.5 kg?

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?

4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation