Which one of the following is an example of an indicator? a. high concentration b. presence of h– ions in solution c. litmus paper d. electricity

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

The energy equivalent of the rest mass of an electron is

Which of the following describe possible scenarios? a) an object has zero instantaneous velocity and non-zero acceleration. b) an object has negative acceleration and is speeding up. c) an object has positive acceleration and constant velocity. d) an object has positive velocity and zero acceleration. e) an object has increasing positive position and negative velocity. f) an object has decreasing positive position and negative acceleration.