1.     Find the atomic spacing in a crystal of rock salt (NaCl), whose cubic structure. The density of rock salt is 2.16x 103 kg/m3 and the average masses of the Na and Cl atoms are respectively 3.82x10-26 kg and 5.89x10-26 kg.
 
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Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?

How to tell if a molecule is polar or nonpolar with electronegativity