Suppose that you are swimming in a river while a friend watches from the shore. in calm water, you swim at a speed of 1.25 m/s . the river has a current that runs at a speed of 1.00 m/s. note that speed is the magnitude of the velocity vector. the velocity vector tells you both how fast something is moving and in which direction it is moving. if you are swimming upstream (i. a., against the current), at what speed does your friend on the shore see you moving?

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.