Okay, let's break this down step-by-step:
* The rate of energy transfer is 30 J/s ( joules per second )
* We need to produce 1500 J of heat energy
* So we divide the total energy needed (1500 J) by the energy transfer rate (30 J/s)
* 1500 J / 30 J/s = 50 seconds
Therefore, the time taken to produce 1500J of heat energy if the rate of energy transfer is 30 J/s is 50 seconds.