Air at 20 Celsius and 483 kPa (70 psig) gauge expands to atmospheric pressure (79 kPa). If the process is isentropic, what is the final temperature in Celsius? Present answer using three significant digits.

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.