You are on top of a hospital, 10 stories high, enjoying an outdoor courtyard. each level is 12.0 feet high. your friend who’s in physics says if you drop a penny that it will be going 120m/s when it hits the ground, if you neglect air resistance. reproduce the math to prove them wrong.

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?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

The mantle is made up of which structural zones?