Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere? a. water vapor (h2o)b. carbon dioxide (co2)c. hydrogen (h2)d. oxygen (o2)e. nitrogen (n2)

Aa a of 22 m/s at an of 36.9 .be . a. b. c. (3)x y of? (3)go? (4) () it to to ?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?