Which elements do hydrogen fuel cells combine to produce electricty

A baseball is dropped from 100 meters above the surface of the Earth. The baseball falls to the ground. What would happen if this baseball was dropped from 100 meters above the surface of the Moon? A. It would fall toward the Earth's surface. B.

A 1500 kg car starts at rest and speeds up to 3.0 m/s. The gain in kinetic energy is 6750 J. We define efficiency as the ratio of output energy in this case kinetic energy) to input energy. If this car's efficiency is 0.30.

Covalent bonds form because most atoms seek to have how many electrons in their most outer shell?

The mass of Saturn can be determined by applying Kepler's 3rd Law to the motion of a single ice particle in its rings. A) True B) False

Which of the following is a major ocean on Earth? A. Mediterranean B. Gulf of Mexico C. Bering Sea D. Indian

Which of the following is evidence used to support the Big Bang Theory? background radiation increasing distances between galaxies both of the above

Which of the following statements about noncovalent bonding interactions is NOT true? Van der Waals interactions, also known as dispersion forces, are the weakest of the attractive noncovalent bonding interactions.

Does a rising GDP benefit everyone

You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 * 10-19 C. Answer in units of µC.

Which formula can be used to find the x-component of the resultant vector?