Choose the best answer for each situation. a scientist with the epa examining water for contamination writes down that there was an iridescent sheen on the surface of the water. what type of data did the scientist record?

Aforce of 200 n is applied to an input piston of cross-sectional area 2 sq. cm pushing it downward 2.8 cm. how far does the output piston of cross-sectional area 12 sq. cm move upward? show all work.

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?