1. What's a heat transfer that occurs when there is direct contact between objects? A. Conductors
B. Insulators
C. Electromagnets
D. Conductions

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

I’ve been stuck on this for a while

What explosion in the upper solar atmosphere releases about as much energy as millions of 100-megaton hydrogen bombs exploding simultaneously?