Timmy has 2,630 J of mechanical energy at the top of a diving board. Timmy musters up the courage to jump off the diving board, but unfortunately for him, nails a perfect belly flop. How much mechanical energy does Timmy
have when he reaches the water?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?