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.

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

The dot diagram represents the motion of the motorcycle as it moves from left to right