Full calculations. Not for handing in 1. What is the pH of the following aqueous solutions?
a) 1.5 x 10^2 mM HCl​

answer; always; never;

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.