Sodium hydroxide (naoh) was added to pure water (h2o). which most likely were the ph values of the water before and after the sodium hydroxide was added to it?
a. before = 7, after = 9
b. before = 7, after = 4
c. before = 4, after = 7
d. before = 9, after = 7

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to: