THIS IS SOOO IMPORTANT PLS HELP I’LL GIVE BRAINIEST Describe the evidence of chemical changes that occurred during the etching process in:

a. your circuit board.

b. the copper chloride etching solution.

Give at least one piece of evidence for parts a & b--> Have at least one full sentence for each answer.

Name the non metal condut electricity

How do we measure or think of speed in the united states?

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600