Joel inflates a balloon and ties it off. He then rubs the balloon against his hair, which makes his hair stand up. He then places the balloon near the classroom wall and sticks it to the wall. Finally, he
pops the balloon with a pin. Which of these is an example of gaining a charge by friction in this example?

A. Rubbing the balloon against his hair
B. Placing the balloon near the classroom wall
C. Touching the balloon to the classroom wall
D. Popping the balloon with a pin

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.