Numerical: 1. A ball of mass 0.2kg falls from a height of 45m. on striking the ground it rebounds in 0.1 sec

with two third of the velocity with which it struck the ground. Calculate (i) the momentum

change on hitting the ground, (ii) the force on the ball due to the impact.

Name two kinds of practical electric pumps.

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.

The ability to make things happen is also called a. heat b. force c. matter d. energy