As the ambulance got closer, marge noticed that the pitch of the siren got higher. this happened because

a) the sound waves were pushed closer together.

b) the human ear increases pitch over time.

c) the ambulance was further away.

d) the volume increased.

A)the sound waves were pushed closer together

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

just took the test its not "d"