The figure shows a negatively charged sphere and a balloon that has been rubbed with dry human hair . if the two are brought close to each other but do not touch each other you can predict that objects a) attract each other b) polarize each other c) repel each other d) charge each other

Can someone me with these problems? see the attachment, .

Ms. sullivan's class is designing a miniature roller coaster. after first setting it up, they find that it didn't have enough speed to go through the loop de loop. instead of taking out the loop, they decide to increase the height of the first hill the coaster goes down, and this adds the speed needed to make it through the loop. what would be a drawback to this plan in real life? a) no one likes loop de loops. b) there is no downside to this plan. c) a higher hill means a scarier ride. d) a higher hill takes more time and material to build.

How many particles are in 5.0 ml of fe