Use the following picture to answer question 30: 30. the picture above shows 3 sets of balloons, all with a particular charge. which of the picture(s) is true? explain. then explain why the other 2 pictures are incorrect. make sure to explain all 3 sets. use the following picture to answer question 31: 31. the bars in the drawing above are magnets. according to chapter 21, which of the following picture(s) is true? explain. then explain why the other 2 pictures are incorrect. make sure to explain all 3 sets. 32. based on how the book describes a heat pump in sec 16.3, how does a heat pump prove the law of conservation of energy? hint: think about a refrigerator. 33. a bird flies from the south pole to the north pole. part of the journey is 1000 miles that takes 2 weeks. what is the bird’s velocity in that time? show work for credit and include final units.

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal

Astudent from one of the research labs is having trouble preparing a slide for examination and photographing. the bacterial slide that he has brought to you was prepared using a commercially purchased stain. he has asked for your in determining what he is doing wrong so that he can change the lab protocols and continue on with his project. after examining the slide under oil immersion, you determine that no bacteria are present even though the student is able to show you the culture he used to make that slide that has visible growth in the liquid medium. which of the following statements does not explain the fact that there are no bacteria present on the student’s slide? by not allowing a glass slide to completely air dry before heat fixation, the flame will cause the surrounding water to boil and this will damage the bacterial cell. overheating during the fixation step boiled the water within the bacterial cells and resulted in the cells bursting. insufficient heating of the slide did not drive out the thin layer of water and this resulted in minimal bonding between the bacteria and the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide.

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping