How many gallons of blood does it pump? (estimate that the heart pumps 50 cm3 of blood with each beat.)

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

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?

For those who need theses answers i just took the test and got everyone of them