Stan runs a comb through his hair then brings it near several strips of paper. The paper starts to move without Stan
touching it. His little sister is amazed and wants to know how the trick works. Stan says that the comb has a static
charge, but doesn't know how it got its charge. What would you tell Stan?

Protons from Stan's hair transferred to the comb giving it a negative charge.

Electrons move from the comb to Stan's hair giving it a neutral charge.

Electrons from the paper strips jumped to the comb causing the strips to move.

Electrons from Stan's hair transferred to the comb giving it a negative charge.

Enzyme speed up chemical reaction are which type of marcomolecule? a.carbohhydrates b.protiens c.lipids d.nucleic acids

The population of bacteria in a petri dish doubles every 40 seconds. the population of the bacteria is initially 400 organisms. what unit is most appropriate for the time at which the number of bacteria is 300? hour bacteria per hour second bacteria per second

Consider the motion of the balloon and its air contents in terms of momentum. in step 1 above, the total momentum of the balloon and its contents was zero. recall that momentum = mv. both the balloon and the air inside it had a velocity of zero and therefore the total momentum was zero. now think about what happened when the air escaped from the balloon. a certain mass of air accelerated in one direction. in order to keep the total momentum of the system zero, the balloon itself (which has mass) had to accelerate in the opposite direction. use this scenario to you explain why the soda can rotates when the water squirts out of the escape holes. what was your hypothesis concerning the water-filled can? according to your data, do you think your hypothesis was correct? (be sure to refer to your data when answering this question.) summarize any difficulties or problems you had in performing the experiment that might have affected the results. describe how you might change the procedure to avoid these problems. give at least one more example of newton's third law in everyday life.