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A 1.38-kg book is at rest on a wooden board inclined at 13 degrees. Find the magnitude of the force of static friction.? Find the maximum rate of change of f(x,y,z) = x + y/z at the point (-2, 3, 2) and the direction in which it occurs.? Why does wikipedia say motor's back-EMF is "not due to the motor's inductance but a separate phenomenon", which phenomena? The Ka of a monoprotic weak acid is 8.34 × 10-3. What is the percent ionization of a 0.196 M solution of this acid? A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4?