Which of these systems can be explained by Newton’s laws of motion and gravitation? Select all that apply.

the motion of electrons in an atom
the motion of Earth around the Sun
the motion of a race car on a racetrack
the motion of a ball falling on Earth

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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?

Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 c. what is the vapor pressure of ethanol at 14 c?