Which of the processes is exothermic? evaporation of alcohol sublimation of iodine solidification of volcanic lava burning of paper

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

Area around a charged object where the objects can exert a force on another charged objects is an electric