Helium gas is in thermal equilibrium with liquid helium at 4.20 K. Even though it is on the point of condensation, model the gas as ideal and determine the most probable speed of a helium atom (mass 5 6.64 3 1027 kg) in it.
PHYSICAL GEOGRAPHY Our Place in Space Big Bang Theory: The Universe emerged from a singular, enormously dense mass about 14 billion years ago. Evidence: 1) the most distant star clusters are moving away from us at a greater speed than those that are closer, and 2) amount of cosmic microwave background radiation is uniform throughout the universe – leftover energy from an early period of rapid expansion Galaxy: largest definable unit within the universe (ex. Milky Way is our galaxy) Oblate spheroid: The Earth is not a perfect circle. It bulges at the Equator, and flattened at the poles The bulge is caused by a centrifugal force Sun angle: angle at which the sun’s rays strike Earth’s surface Rela