Ar is a solid below -189 oc with a face-centered cubic array of atoms and a supposed density of 1.32 g/cm3. assuming that the atoms are spheres in contact along the face diagonal, what is the radius of a ar atom (in angstroms)? an angstrom = 10-10 m or 10-8 cm. hint, first find the length of an edge of the unit cell. (argon's actual density is 1.65 g/cm3.)

An asteroid is discovered in a nearly circular orbit around the sun, with an orbital radius that is 2.47 times earth's. what is the asteroid's orbital period, its "year," in terms of earth years?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)