The escape velocity required for gas molecules to overcome the earth's gravity and go off to outer space is 1.12 *10^3 m/s at 15 degrees celsius. calculate the molar mass of a species with that velocity. would you expect he or h2 molecules in the earth's atmosphere? how about argon atoms?

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?