Help Me Please! You are sitting (at rest) in a rolling chair holding a bowling ball.

a. What is the total momentum of the system?

b. If you throw the bowling ball, what will happen to you?

c. How will your backwards momentum compare to the momentum of the ball?

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

temp rises, and expansion

i don't understand. explain it clearly