2. The air in a room has a mass of 50 kg and a specific heat of 1,000 J/kg*C. What is the change in thermal energy of the air when it warms from 20 to 30 degrees celsius?

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

The answer is b because a,c,and d are opinons

What record? the question is incomplete