1. A is a determination of an amount of something. 2. If you were given a number, say the number “22”, how would you know what it meant?

You would have to give it a , or people might think you were talking about bowling balls or flowers!

3. Two common systems of measurements are the system and the

system.

4. The width of your pinky is about the length of a

a) Meter b) centimeter c) millimeter d) kilometer

5. Two meanings of identifying are one particular moment, and a quantity or interval.

6. In our science class, we measure and record time in a) hours b) light years c) seconds

7. What is your age in seconds? (show your work!) Is this an appropriate way to discuss your age?

8. To convert a time into seconds, 1) separate the total time into amount of time in each unit, 2) convert each separate quantity of time into seconds, and 3) all the seconds.

9. describes how far it is from one place to another.

a) Weigh b) distance c) time

10. The basic unit of measurement for length in the metric system is the .

a) Centimeter b) kilometer c) meter d) millimeter

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature,thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

How would a small bar magnet be oriented when placed at position x?