Which characteristic would you expect from a sample with a ph of 9

The equation that describes a transverse wave on a string is y = (0.0120 m)sin[(927 rad/s)t - (3.00 rad/m)x] where y is the displacement of a string particle and x is the position of the particle on the string. the wave is traveling in the +x direction. what is the speed v of the wave?

What is the single most important equation in all of physics?

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?