Which of the following are good ways to test whether a solution is an acid or a base? tasting it litmus paper phenolphthalein touching it

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

Find the equation for the plane through upper p 0 left parenthesis negative 4 comma negative 8 comma negative 5 right parenthesis perpendicular to the following line. xequalsnegative 4 minus t, yequalsnegative 8 plus 2 t, zequals3 t, minusinfinityless thantless thaninfinity

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?