The temperature u in a thin circular metal plate of radius 1 m only depends on the distance r from the utre of the: plai. aai the cienlar blry ofth plaie is perectly iesaisl (ie no heat flow across the boundary) determine the temperature u in the plate at time t, given a temperature distribution u-f(r) at t0

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.