Read the following passage and find the two errors. Then, choose the answer that corrects the errors.
pH is a measure of the concentration of OH ions in a solution of an acid or base. The pH scale plots
the concentration of solutions in a range from 0-16. (2 points)
O pH is a measure of the concentration of Htions in a solution of an acid or base. The pH plots the
concentration of solutions in a range from 0-14.
O pH is a measure of the concentration of Htions in a solution of an acid or base. The basic scale plots the
concentration of solutions in a range from 0-16.
O pH is a measure of the concentration of OH ions in a solution of water. The pH scale plots the concentration
of solutions in a range from 0-12.
O pH is a measure of the concentration of OH ions in a solution of an acid or base. The acid scale plots the
concentration of solutions in a range from 0-16.

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.