Abaseball starts from rest and rolls 40.0 m down a hill in 10.0 seconds what is the acceleration

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

Which of these activities increases the amount of carbon in the atmosphere?