Which best explains the inability for life to exist in earth’s early atmosphere? check all that apply. there was insufficient energy from material collisions to change their density. high temperatures during precambrian time caused surface water evaporation. volcanic eruptions and comet collisions added different gases to the atmosphere. available oxygen was used to create an ozone layer within earth’s atmosphere. the oxygen content in earth’s atmosphere was too low to support cellular processes.

The density of gold is 19.3g/cm3. what is the volume of a 13 g gold nugget? ( density: d= m/v)

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?