Two brothers are playing soccer on the beach. One brother kicks the ball really Hard and the ball lands in the water, about 50 meters from the beach. They wonder if the ball will float back to the beach.

Who is correct?

A. Todd: Waves carry objects as they travel through water. If we wait, the waves will move the ball back onto the beach.

B. Brian: Waves don’t carry things as they travel through water. I think we need to swim out and get the ball.

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?

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match