A2.0 kg ball and a 3.5 kg ball, each moving at 0.90 m/s, undergo a head-on collision. the lighter ball rebounds opposite its initial direction, with speed 0.90 m/s. find the post-collision velocity of the heavier ball. assume the initial direction of the lighter ball as positive. how much mechanical energy was lost in this collision? express your answer in j. how much mechanical energy was lost in this collision? express your answer as a fraction of the system's initial mechanical energy.

Tungsten-filament lightbulb emits light based on the temperature of the filament. which phenomenon does this demonstrate?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

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.