Question

If 30 J of work was performed by a system in every way was insulated. How much heat energy is transferred? 

Answer 1

Gives

∆w=30J

First law of thermodynamics

$∆Q=∆U+∆W$

Insulated system

∆Q=0

∆U=-∆W

∆U=-∆W=-30J

Heat transfer of system =30J