Read the students notes very carefully and write a complete materials list for the investigation. This investigation was about pulse rate we checked or pulse rates when we were resting and during different kinds of exercise. I thought that exercise would make our pulse rates increase. We used to watch with a second hand time ourselves when we measured our pulse rates. We measured our pulse for 15 seconds. We can use this measurement to calculate pulse rates per minute. We also check the pulse five minutes after exercise. We wanted to see if our pulse rates returned to the resting level. We will need to do calculations in order to convert these results to pulse rate per minute. These results should allow us to see the effect of exercise on our pulse rates. While we were investigating, we noticed that there are differences between our pulse rates. We wonder how much variation there is among all the students in our class.

Kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energy b. motion energy c. sound energy d. thermal energy

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 ..

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud