Figure 10.29 in your textbook is an energy bar chart for a mountain climber pulling a bag of supplies up a slope. Suppose, instead, she uses the rope to lower the bag down the slope. Which of the bars of the chart will be negative? Select all that apply,

a.) Ki

b.) Kf

c.) Ui

d.) Uf

e.) Wext

f.) ΔEth

Please explain why, I have an exam coming up on this and want to understand.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!