Take 85 points PLEASE Help Me A galvanic cell consists of an SHE (as the left-hand electrode) with standard potential equals to -0.76 volt. It has a rod of zinc dipping into a solution of zinc ions at 298 K gave measured emf of -0.789volt and s is 0.059.
What is the activity of the zinc ions? use these equation E=E°+s log[ion]​

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?