1. earth is located at one of the moon's orbit.2. according to kepler's second law, jupiter will be traveling most slowly around the sun when at .3. earth orbits in the shape of a/an around the sun.4. the mathematical form of kepler's third law measures the period in years and the in astronomical units (au).5. according to kepler's second law, pluto will be traveling fastest around the sun when at .6. the extent to which mars' orbit differs from a perfect circle is called its:

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

What structural formula represents 4 electrons shared between two atoms?