The unit cell for fe3o4 (feo-fe2o3) has cubic symmetry with a unit cell edge length of 0.839 nm. if the density of this material is 5.24 g/cm3, compute its atomic packing factor. the ionic radii of fe2+, fe3+ and o2- are 0.077 nm, 0.069 nm and 0.140 nm, respectively. in addition, the atomic weights of iron and oxygen are, respectively, 55.85 g/mol and 16.00 g/mol.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km. h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).